Oral Thrush (Oral Candidiasis)
Oral thrush is what most people have when creamy white patches show up on the tongue or inside the cheeks and a gentle wipe leaves a red, tender spot underneath. Sometimes there are no white patches at all, just a sore, red mouth and a strange cottony feeling. It's a yeast infection, it's common, and it responds well to treatment once the reason it started is sorted out.
Oral thrush (oral candidiasis) is an overgrowth of Candida, a yeast that normally lives in the mouth. It causes white patches that wipe off, or red, sore areas, often under dentures. It rarely spreads between healthy adults. A prescription antifungal usually clears it in 1 to 2 weeks. See a dentist or doctor if it keeps returning, swallowing hurts, or you can't find an obvious cause.
Not sure this is what you have? Answer five quick questions in our mouth spot checker. It compares what you see with more than 40 common conditions and tells you how soon to have it looked at.
- What oral thrush looks like
- Where thrush shows up
- Types of oral candidiasis
- The wipe test
- Other white patches in the mouth
- What causes oral thrush
- Symptoms
- Is it contagious?
- How long it lasts
- Home care, step by step
- Over-the-counter options
- Prescription treatment
- Denture stomatitis
- Preventing thrush
- Thrush in babies
- Cancer treatment and weak immunity
- When thrush points to something else
- When to call us
- FAQ
What oral thrush looks like
The classic look is soft, raised, creamy white or yellowish spots, a bit like cottage cheese or dried milk. They can be small dots or merge into a thick coating. In adults you'll usually see them on:
- The top of the tongue
- The inside of the cheeks and lips
- The roof of the mouth and the back of the throat
The giveaway is that the patches come off. Rub one gently with a piece of gauze and it lifts away, leaving a red, raw, sometimes slightly bleeding surface. Not every case is white, though. Thrush in denture wearers and people using steroid inhalers is often just red and sore, which is why it gets missed.
Where thrush shows up in the mouth
Candida can grow on almost any surface in the mouth, but it has favorite spots. The pattern often hints at the cause. White patches spread around the cheeks and tongue are typical after antibiotics or in babies. A red palate shaped exactly like an upper denture points to the denture. A red patch on the roof of the mouth and the middle of the tongue that "kiss" when you close is a common pattern in people who use steroid inhalers or smoke.
Types of oral candidiasis
Dentists sort thrush by how it looks. You can have more than one type at once.
| Type | What you see | Who tends to get it |
|---|---|---|
| Pseudomembranous ("classic" thrush) | Creamy white plaques that wipe off and leave a red base | Babies, people after antibiotics, people with weak immunity, people on chemotherapy or radiation |
| Erythematous (red thrush) | Red, sore, burning areas with few or no white spots. Often a smooth red patch on the tongue where the bumps have worn away. | People who just finished antibiotics, steroid inhaler users, people with dry mouth |
| Denture stomatitis | Red, sometimes spotty tissue right under an upper denture. Often painless. | Denture wearers, especially those who sleep in their dentures |
| Angular cheilitis | Cracked, red, sore corners of the mouth. Candida is one of the usual causes, often with bacteria. | Denture wearers, people whose bite has collapsed, people who lick their lips or drool at night |
Angular cheilitis often travels with thrush inside the mouth, so we look at both. There's more on that in our page on angular cheilitis and cracked mouth corners.
Thrush vs. white tongue vs. leukoplakia: the wipe test
A lot of people search "white tongue" and assume it's thrush. Usually it isn't. Most white tongues are just a coating of dead cells, bacteria, and food debris trapped between the tiny bumps on the tongue. Dehydration, mouth breathing, fever, and not brushing the tongue all make it worse.
Dentists use a simple test. We gently wipe the area with gauze. What happens next tells us a lot.
| Oral thrush | White tongue coating | Leukoplakia | |
|---|---|---|---|
| What it is | Candida yeast overgrowth | Debris and bacteria caught between tongue bumps | A thickened white patch of the lining itself |
| Where | Tongue, cheeks, palate, throat, under dentures | Top of the tongue, mostly toward the back | Anywhere, often the side of the tongue, floor of mouth, cheeks, or gums |
| Wipes off? | Yes, leaving a red, raw base | Partly. Brushing or scraping the tongue thins it and the tissue underneath looks normal. | No |
| Symptoms | Cottony feeling, burning, taste changes, pain swallowing | Usually none except bad breath or a dull taste | Usually none |
| What to do | See us or your doctor for an antifungal and a look at the cause | Drink more water, brush or scrape the tongue daily | Have it examined. A biopsy is often needed to know what it is. |
Leukoplakia is the one not to ignore. Most patches turn out to be harmless, but some show early cell changes, and the only way to know is to look closely and often take a small biopsy. Read more about white patches that don't wipe off (leukoplakia).
Other white patches in the mouth
- Milk residue in babies. A thin white film on a baby's tongue right after feeding that wipes off easily, with normal pink tissue underneath. Thrush tends to sit on the cheeks, gums, and lips too, and it takes more than a light wipe to lift it.
- Oral lichen planus. Lacy white lines, usually on both cheeks, that don't wipe off. It can have red, sore areas and sometimes gets thrush on top of it. See oral lichen planus.
- Oral hairy leukoplakia. White, ridged, almost corrugated patches on the sides of the tongue that don't wipe off. It's caused by the Epstein-Barr virus and usually shows up when the immune system is weakened.
- Geographic tongue. Smooth red patches with wavy white borders that move around over days. It's harmless and isn't an infection. See geographic tongue.
- Cheek biting and friction. Shaggy, white, frayed tissue along the bite line of the cheeks from chewing or rubbing.
- Chemical burns. White, peeling tissue where aspirin, a strong mouthwash, or a whitening product sat against the lining.
What causes oral thrush in adults?
Most of us carry some Candida in our mouths all the time. Saliva, healthy bacteria, and a working immune system keep it in check. Thrush happens when something tips that balance. In adults, there's almost always a reason, and finding it is half the treatment.
Common causes and risk factors
- Antibiotics. They clear out bacteria that normally compete with yeast. Thrush often shows up during or right after a course.
- Dentures, especially ones worn overnight, ones that don't fit well, or ones that aren't cleaned thoroughly. Yeast lives in the tiny pores of denture acrylic.
- Steroid inhalers for asthma or COPD, if you don't rinse afterward. Steroid pills and steroid mouth rinses can also do it.
- Dry mouth from medicines, Sjögren's disease, radiation, or aging. Saliva is one of the mouth's main defenses against yeast. Our dry mouth page covers causes and fixes.
- Diabetes, particularly when blood sugar runs high.
- Chemotherapy and head and neck radiation.
- A weakened immune system from HIV, organ transplant medicines, or other immune-suppressing drugs.
- Smoking.
- Age. Babies in their first few months and older adults get thrush more often.
- Iron, B12, or folate deficiency, which thins the lining of the mouth.
Symptoms of thrush in the mouth
Some people have no symptoms at all and only find out at a dental visit. Others feel it before they see anything. Common symptoms include:
- A cottony or "furry" feeling in the mouth
- Loss of taste, or a bad or metallic taste
- Burning or soreness, especially with spicy or acidic food
- Redness and soreness under a denture
- Cracks and soreness at the corners of the mouth
- Pain when swallowing, if the patches reach the back of the throat
Is oral thrush painful? Mild cases often aren't. The red form tends to burn more than the white form. If swallowing hurts badly or food feels stuck behind the breastbone, the infection may have spread into the esophagus, and that needs a physician's attention.
Is oral thrush contagious?
For healthy adults, not really. Candida is already in most people's mouths, so kissing someone with thrush or sharing a fork rarely causes an infection unless your own defenses are down. Thrush is mostly about your own mouth's balance, not catching a germ.
Babies are the exception. A newborn can pick up yeast during a vaginal birth. A nursing baby with thrush and a breastfeeding mother can pass it back and forth between the baby's mouth and the mother's nipples. That's why both are usually treated at the same time. People with weakened immune systems should also be a bit more careful about sharing utensils and toothbrushes.
How long does oral thrush last?
With treatment, most people feel better within a few days, and a typical antifungal course runs about 1 to 2 weeks. Keep using the medicine for the full time you're told to, even once the patches are gone, or it tends to come right back.
Can oral thrush go away on its own? Sometimes. Mild thrush in a healthy baby can clear without treatment over a week or two, and a mild case after antibiotics may settle once the course ends. In adults with an ongoing cause, like a denture worn at night, an inhaler, or dry mouth, it usually hangs on or comes back until that cause is addressed. How long oral thrush lasts without treatment really depends on why it started.
Oral thrush home care, step by step
Home care won't replace an antifungal for a real infection, but it helps the medicine work and keeps thrush from returning.
- Brush twice a day with a soft brush, including your tongue. Replace your toothbrush once you've finished treatment.
- Rinse with warm salt water (½ teaspoon salt in a cup of water) a few times a day. Swish and spit. It's soothing and helps clear debris.
- Take dentures out at night and clean them every day (see the denture section below). If you have thrush and wear a denture, the denture needs treating too.
- Rinse after your inhaler. Swish water and spit after every dose of a steroid inhaler.
- Cut back on sugar and sweet drinks while you heal. Yeast feeds on sugar.
- Keep your mouth moist. Sip water through the day, use sugar-free gum or lozenges, and ask us about saliva substitutes if your mouth is dry.
- If you have diabetes, check your blood sugar. Thrush can be a sign it's running high.
Things that don't help much
- Scrubbing the patches off. You'll make the tissue raw and it won't kill the yeast underneath.
- Leftover antibiotics. Thrush is a fungus. Antibiotics can make it worse.
- Relying only on yogurt, probiotics, coconut oil, or apple cider vinegar. Some may be harmless add-ons, but the evidence is thin and they don't replace an antifungal.
OTC medicine for thrush in the mouth: what's actually available
We'll be straight with you here. In the United States, there's no over-the-counter antifungal approved for treating thrush inside the mouth. The antifungals that work in the mouth (nystatin, clotrimazole troches, miconazole buccal tablets, and fluconazole) all need a prescription. A quick visit with us or your physician is usually the fastest route.
What you can buy without a prescription helps with comfort and prevention:
| Product | How it helps | Things to know |
|---|---|---|
| Denture cleansing tablets or soaks | Clean yeast off dentures overnight | Use as the label directs. Rinse the denture well before putting it back in. Not a substitute for brushing it. |
| Antifungal skin creams (clotrimazole, miconazole) | Sold for skin; sometimes recommended for cracked corners of the mouth | Ask us first. They're for the skin at the corners, not for use inside the mouth, and not meant to be swallowed. |
| Saliva substitutes and dry-mouth rinses | Keep the mouth moist, which helps prevent thrush | Choose sugar-free, alcohol-free products. |
| Numbing gels (benzocaine, lidocaine) | Short-term relief before meals if it's sore | Treats pain only, not the yeast. Do not use benzocaine in children under 2. |
| Pain relievers (acetaminophen, ibuprofen) | General soreness | Take as the label directs. |
Older remedies like gentian violet are no longer recommended because of safety concerns. Skip them.
Treatment for thrush in the mouth: prescription antifungals
The right antifungal for thrush in the mouth depends on how much is there, where it is, your other medicines, and whether you wear a denture. These are the ones we and your physician use most often.
| Medicine | How it's used | Good to know |
|---|---|---|
| Nystatin oral suspension | Liquid you swish around the mouth and then swallow or spit, several times a day | Works on contact, so hold it in your mouth as long as you can. It's sweetened, so keep brushing well. Also used for babies. |
| Clotrimazole troches | A lozenge you let dissolve slowly in the mouth, several times a day | Don't chew or swallow it whole. Contains sugar, which matters with long use. |
| Miconazole buccal tablet (Oravig) | A small tablet that sticks to the upper gum, just above the front teeth, once a day and slowly dissolves | Convenient once-a-day option. Not for people allergic to milk protein. |
| Fluconazole (Diflucan) | A pill taken by mouth | Used for moderate to severe cases or when topical treatment fails. Interacts with some common medicines, including warfarin and some statins, so we check your list. Usually avoided in pregnancy. |
What a dentist can do for oral thrush
- Confirm it's thrush. We look at the pattern, do the wipe test, and if needed take a quick swab or scraping. A white patch that doesn't wipe off gets a different workup, which may include a biopsy.
- Prescribe the antifungal that fits your situation, and check it against your other medicines.
- Treat the denture. We adjust or reline a loose denture, show you how to disinfect it, and talk about whether it's time for a new one. Learn more about dentures and denture care.
- Find the cause. Inhaler technique, dry mouth, sugar habits, smoking, or a medicine that's drying you out.
- Coordinate with your physician when thrush keeps coming back, when we suspect diabetes or an immune problem, or when it's in the throat or esophagus.
Our oral medicine and diagnosis page explains how we work up mouth problems that don't have an obvious cause.
Denture stomatitis and denture care
Denture stomatitis is thrush's quiet cousin. The tissue under an upper denture turns red, sometimes in dots, sometimes as one solid patch shaped like the denture. Most people feel nothing, and we find it at a checkup. It's very common. Studies of denture wearers report it in anywhere from about 15% to more than 70% of people, depending on the group studied.
The key thing to know: yeast lives on the denture itself. If you treat your mouth but not the denture, it comes back as soon as you stop the medicine.
- Take the denture out at night. Your gums need time to breathe. Sleeping in dentures is one of the biggest risk factors.
- Brush the denture every day with a denture brush and mild soap or denture cleaner, not regular toothpaste, which is abrasive and scratches the acrylic.
- Soak it overnight in a denture cleanser as the label directs, then rinse it well before wearing.
- Brush your gums, tongue, and palate with a soft brush each morning before putting the denture in.
- Have the fit checked. A rocking or rubbing denture irritates tissue and gives yeast a place to settle in.
How to prevent thrush
- Rinse and spit after a steroid inhaler. Use a spacer if your doctor recommends one; it puts more medicine in your lungs and less in your mouth.
- Take care of your dentures as above, and remove them at night.
- Treat dry mouth. Sip water, avoid alcohol-based mouthwash, and ask your physician whether any of your medicines can be adjusted.
- Keep diabetes well controlled.
- Brush twice a day and clean your tongue.
- Quit smoking, or at least cut down.
- Only take antibiotics when you need them. If you get thrush every time, tell the prescriber. They may suggest a preventive plan.
- Keep up with checkups. We often spot denture stomatitis and early thrush before it causes symptoms.
Thrush in babies' mouths
Thrush is very common in the first few months of life. You'll see white patches on the tongue, gums, inner cheeks, or roof of the mouth that don't wipe away as easily as milk. Some babies don't mind it at all. Others are fussy and pull off the breast or bottle because it's sore. Babies can also get a yeast diaper rash at the same time.
Call your pediatrician rather than treating a baby yourself. They'll confirm it and usually prescribe nystatin liquid. A few more things help:
- Breastfeeding? Your nipples may need treatment too, even if they look fine. Signs include pink, shiny, cracked, or itchy nipples, or burning or shooting pain during or after feeds. Talk to your own doctor or a lactation consultant so you and the baby are treated together.
- Boil or sterilize pacifiers and bottle nipples every day while you're treating it, and replace them once it's cleared. Clean breast pump parts that touch milk.
- Don't scrape the patches off a baby's mouth. It hurts and causes bleeding.
- Watch feeding and diapers. Call sooner if your baby is feeding poorly, has fewer wet diapers, or has a fever.
How to remove thrush from a baby's mouth comes down to the medicine, not wiping. The patches fade as the treatment works.
Thrush during cancer treatment and with a weakened immune system
Thrush is one of the most common mouth problems during chemotherapy and head and neck radiation. Radiation can damage the salivary glands, and chemotherapy lowers the body's defenses, so yeast gets an easy foothold. In these patients thrush can be more widespread, more painful, and slower to clear, and it often needs fluconazole rather than a rinse alone.
Dr. Henley works with patients before, during, and after cancer treatment to keep the mouth as healthy as possible. Read about our dental care for head and neck cancer patients. People with HIV, organ transplants, or other immune-suppressing conditions benefit from the same close watch. Our care for medically complex patients page explains how we coordinate with your medical team.
When thrush is a sign of something else
A single bout of thrush after a round of antibiotics isn't something to worry about. Thrush that keeps returning with no clear trigger is different. If you don't wear dentures, don't use a steroid inhaler, haven't had antibiotics, and still keep getting it, it's worth checking for:
- Diabetes or prediabetes, with a simple blood test
- Iron, B12, or folate deficiency
- A problem with the immune system, including undiagnosed HIV
- Dry mouth from a medicine or a condition like Sjögren's disease
- A medicine that suppresses the immune system
We'll talk with you about what we see and send a note to your physician so the right tests get done. Thrush can also sit on top of other conditions like lichen planus, so if a patch remains after the yeast is treated, we'll take a closer look. Our oral cancer screening page explains why any patch that won't go away deserves an exam.
When to see a dentist or doctor about oral thrush
Make an appointment if:
- You think you have thrush and it hasn't improved in a few days
- It comes back after treatment, or you've had it more than twice in a year
- You wear dentures and the tissue underneath is red or sore
- You have cracked, sore corners of the mouth that won't heal
- A white patch doesn't wipe off, or a patch is still there after treatment
- You have no obvious reason to get thrush
Get care quickly if:
- Swallowing is painful or food feels stuck in your chest
- You have a fever along with mouth sores
- You're on chemotherapy, have had a transplant, or have HIV and notice new white patches
- A baby with thrush is feeding poorly, has fewer wet diapers, or has a fever (call your pediatrician)
Oral thrush FAQ
What is oral thrush?
Oral thrush, or oral candidiasis, is an overgrowth of Candida yeast in the mouth. Candida normally lives there in small amounts without causing trouble. When something upsets the balance, like antibiotics, dentures, a steroid inhaler, dry mouth, or a weakened immune system, it grows out of control and causes white patches or red, sore areas.
How do you get rid of oral thrush?
Most cases need a prescription antifungal such as nystatin suspension, clotrimazole troches, a miconazole buccal tablet, or fluconazole pills. It's just as important to fix the cause: clean and remove dentures at night, rinse after a steroid inhaler, treat dry mouth, and control blood sugar. Finish the full course even after the patches disappear.
What does oral thrush look like?
Usually creamy white or yellowish raised patches on the tongue, inner cheeks, roof of the mouth, or throat, a bit like cottage cheese. When wiped gently, they come off and leave a red, sore surface. Some thrush is red instead of white, especially under dentures or in people who use steroid inhalers.
Is oral thrush contagious?
Not usually between healthy adults, because most people already carry Candida and their mouth keeps it in check. Babies are the exception. A baby can pick it up during birth, and a nursing baby and mother can pass it back and forth between the baby's mouth and the mother's nipples, so both are usually treated together.
What causes oral thrush in adults?
The most common causes are antibiotics, dentures (especially worn overnight), steroid inhalers used without rinsing, dry mouth, diabetes, smoking, chemotherapy or radiation, and conditions or medicines that weaken the immune system. In adults there is almost always a reason, and treating that reason keeps thrush from coming back.
Can oral thrush go away on its own?
Mild thrush in healthy babies, or a mild case right after antibiotics, sometimes clears on its own in a week or two. In adults with an ongoing cause such as dentures, an inhaler, or dry mouth, it usually lingers or returns until treated. If it hasn't improved in a few days, it's worth getting a prescription.
How long does oral thrush last without treatment?
It varies. A mild case may fade within a couple of weeks once the trigger is gone, like after an antibiotic course ends. If the cause is still there, untreated thrush can last for weeks or months and may spread toward the throat. With an antifungal, most people improve within days and finish treatment in about 1 to 2 weeks.
Is there an over-the-counter antifungal for thrush in the mouth?
Not in the United States. Antifungals that treat thrush inside the mouth, including nystatin, clotrimazole troches, miconazole buccal tablets, and fluconazole, all require a prescription. Over-the-counter products like denture cleansers, saliva substitutes, and numbing gels help with comfort and prevention but don't cure the infection.
Is oral thrush painful?
It can be. Mild thrush may cause only a cottony feeling or a change in taste. Red thrush and denture-related thrush often burn, especially with spicy or acidic foods. Pain when swallowing can mean the infection has reached the throat or esophagus, which needs prompt medical care.
How do infants get oral thrush?
Babies can pick up yeast from the birth canal during delivery, and their immune systems and mouth bacteria are still developing. Breastfeeding, pacifiers, and bottle nipples can keep it going. Thrush is common in the first few months and is usually treated with nystatin prescribed by a pediatrician.
Can a steroid inhaler cause thrush?
Yes. Inhaled steroids for asthma or COPD leave some medicine in the mouth and throat, which lets yeast grow. Rinsing with water and spitting after every dose, and using a spacer if your doctor recommends one, greatly lowers the risk. Don't stop your inhaler on your own; talk with your doctor if thrush keeps happening.
Is a white tongue always thrush?
No. Most white tongues are a harmless coating of dead cells, bacteria, and food debris, often from dehydration, mouth breathing, or not brushing the tongue. A coating thins out with brushing and has normal pink tissue underneath. Thrush wipes off to leave red, raw spots. A white patch that won't wipe off at all should be examined.
Why does my thrush keep coming back?
Usually because the cause hasn't been fixed: a denture that isn't disinfected or is worn overnight, an inhaler used without rinsing, ongoing dry mouth, or high blood sugar. Stopping treatment too early is another common reason. If none of those apply, see your dentist or physician to check for diabetes, vitamin deficiencies, or an immune problem.
White patches or a sore, red mouth?
If you're in Jacksonville and think you have oral thrush, especially if it keeps coming back or you wear dentures, we're glad to take a look, get you on the right treatment, and help figure out why it started.
Related conditions
Sources
- Pappas PG, Kauffman CA, Andes DR, et al. Clinical practice guideline for the management of candidiasis: 2016 update by the Infectious Diseases Society of America. Clin Infect Dis. 2016;62(4):e1–e50.
- Vila T, Sultan AS, Montelongo-Jauregui D, Jabra-Rizk MA. Oral candidiasis: a disease of opportunity. J Fungi (Basel). 2020;6(1):15.
- Gendreau L, Loewy ZG. Epidemiology and etiology of denture stomatitis. J Prosthodont. 2011;20(4):251–260.
- Lyu X, Zhao C, Yan ZM, Hua H. Efficacy of nystatin for the treatment of oral candidiasis: a systematic review and meta-analysis. Drug Des Devel Ther. 2016;10:1161–1171.
This page is for general education and isn't a diagnosis. Every mouth is different. If you have a sore you're worried about, see your dentist or physician. Photos marked Wikimedia Commons are used under their listed licenses and may have been cropped or resized.