The 7 Warning Signs of Mouth Cancer
Oral cancer often develops quietly, appearing as nothing more than a stubborn sore or a faint patch of color. However, early detection is the single most important factor in successful treatment. From persistent mouth sores to subtle changes in your voice, recognizing these 7 warning signs can save your life. Learn what to look for during your monthly self-exam and when it’s time to seek a professional evaluation.
The most common warning signs of mouth cancer are a sore that doesn't heal, a red or white patch, and a new lump or thickening. Early mouth cancer is often painless, which is why changes get overlooked. Most of these changes turn out to be something harmless, but any of them lasting more than two weeks should be examined by a dentist or physician, who can refer you for further tests if needed.
1. A mouth sore that won't heal
Canker sores and bites usually heal within one to two weeks. A sore or ulcer that is still there after two weeks needs to be looked at, especially if it doesn't hurt. Read about evaluation of mouth sores and patches.
2. Red or white patches
A white patch (leukoplakia) or red patch (erythroplakia) on the gums, tongue, cheeks or floor of the mouth can be precancerous. A patch that doesn't wipe off and doesn't go away should be examined.
3. A lump or thickening
A new lump, rough spot or area of thickened tissue in the mouth, or a lump in the neck, deserves an exam. Your dentist or physician will examine it and refer you for further testing if it needs it.
4. A sore throat or hoarseness that lasts
A sore throat that doesn't clear up, a feeling that something is stuck in your throat, or a change in your voice that lasts more than a couple of weeks can be a sign of a problem in the throat. These are worth raising with your physician.
5. Trouble chewing, swallowing or moving the tongue or jaw
New difficulty chewing, swallowing, speaking or moving your tongue or jaw, without a clear cause such as an injury, should be checked.
6. Numbness or pain
Numbness of the tongue, lip or another part of the mouth, mouth pain that doesn't go away, or ongoing pain in one ear can all be signs worth investigating. [1] [2]
7. Loose teeth or dentures that stop fitting
Gum disease is the most common reason teeth loosen. Teeth that loosen without an obvious cause, or dentures that suddenly stop fitting, can also signal a change in the jaw underneath and should be examined. [2]
How do you check your own mouth?
Once a month, in good light and in front of a mirror:
Remove any dentures.
Look at and feel your lips and the inside of your cheeks.
Stick out your tongue and look at the upper surface, sides and underneath. Lift it and look at the floor of your mouth.
Tilt your head back and look at the roof of your mouth.
Feel along both sides of your neck and under your jaw for lumps.
If you notice a change, note the date. If it is still there in two weeks, call your dentist or physician.
What happens at an oral cancer exam?
The dentist looks at and feels the tissues of your lips, mouth, tongue and throat, and feels your neck and jaw for lumps. It is painless and takes a few minutes. If something needs a closer look, the next step may be a recheck or a biopsy. Only a biopsy can confirm or rule out cancer. Learn how oral cancer screening works at our office. It is part of every comprehensive exam.
Where can you have a mouth change checked in Jacksonville?
If you have noticed any of these signs for more than two weeks, don't wait for your next routine cleaning. Contact our office or call 904-398-1549, and tell the staff what you have noticed so we can schedule you appropriately.
Sources
National Institute of Dental and Craniofacial Research. Oral cancer. Retrieved October 6, 2026.
American Cancer Society. Signs and symptoms of oral cavity and oropharyngeal cancers. Last revised March 23, 2026.
About the author. CJ Henley, DMD, is a general dentist in Jacksonville whose practice focuses on cosmetic and restorative dentistry, dental implants and dental care around head and neck cancer. His role is dental care and coordination with your medical team. He does not provide cancer treatment. Meet Dr. Henley.
CJ Henley, DMD, PA · 3675 Hendricks Avenue, Jacksonville, FL 32207 · 904-398-1549
Updated October 2026.
Causes of a White Tongue and How to Get Rid of It
White tongue is a term used to describe any area of the tongue that has a grayish-white coating on it. The coating may cover the entire tongue, or it may appear in patches.
A white tongue is usually a coating of bacteria, food debris and dead cells trapped between the small bumps on the tongue's surface. Dehydration, mouth breathing, tobacco, alcohol and skipping tongue cleaning make it more likely, and it usually improves with gentle cleaning and more water. [1] A white patch in the tissue itself is different. It may be thrush, oral lichen planus or another change that needs an examination, especially if it persists, hurts or keeps returning.
Is a coating different from a white patch?
A coating can collect on the surface of the tongue. A white patch that remains in one area may need a different evaluation. Do not repeatedly scrape a sore area to test it. Describe the change to your dentist instead.
Can dry mouth contribute?
Persistent dry mouth changes the oral environment and can increase the risk of fungal infection. Tell your dentist about medication changes, mouth breathing and any history of cancer treatment. Do not stop a prescribed medicine on your own.
Could it be thrush or oral lichen planus?
Oral thrush and oral lichen planus can cause white areas, but they need different treatment. A photograph or a description is not enough to choose an antifungal or another medication. Our oral medicine and diagnostic evaluation page explains the role of an examination.
What can I safely do at home?
Drink water through the day. Use a soft toothbrush or a tongue cleaner and clean the tongue gently if it is comfortable. Avoid tobacco and anything that irritates the area. Persistent patches need evaluation even if oral hygiene is good. Do not assume garlic, probiotics or vigorous scrubbing will treat the cause.
Does a white tongue mean cancer?
A white tongue does not by itself mean cancer. Some persistent tissue changes need further investigation. Oral cancer screening can identify an area that needs attention, and a diagnosis may require additional testing such as a biopsy.
Where can I have a tongue change checked in Jacksonville?
Call CJ Henley, DMD at 904-398-1549 or contact us. We are on Hendricks Avenue near San Marco. Note when the change began, whether it hurts and whether it has changed. Bring your medication list and relevant medical history.
Sources
Cleveland Clinic. White tongue. Accessed October 6, 2026.
Mayo Clinic. White tongue: causes. Accessed October 6, 2026.
NHS. Sore or white tongue. Accessed October 6, 2026.
National Institute of Dental and Craniofacial Research. Dry mouth.
About the author. CJ Henley, DMD, is a general dentist in Jacksonville whose practice focuses on cosmetic and restorative dentistry, dental implants and dental care around head and neck cancer. Meet Dr. Henley.
CJ Henley, DMD, PA · 3675 Hendricks Avenue, Jacksonville, FL 32207 · 904-398-1549
Updated October 2026.