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.
April Is Oral Cancer Awareness Month: What to Know
Every hour, 24-hours-a-day, 365-days-a-year, someone dies of oral or oropharyngeal cancer (cancer of the mouth and upper throat). Yet, if oral cancer is detected and treated early, treatment-related health problems are reduced and survival rates may increase.
Each April, the Oral Cancer Foundation and dental organizations use Oral Cancer Awareness Month to encourage people to learn the early signs of mouth and throat cancer and to have an oral cancer exam. Most mouth sores and patches are harmless, but any change that lasts more than two weeks should be examined by a dentist or physician. Finding these cancers early generally makes treatment simpler.
How common is oral cancer?
The American Cancer Society estimates that about 60,480 people in the United States will be diagnosed with cancer of the mouth or oropharynx (the part of the throat behind the mouth, including the tonsils and base of the tongue) in 2026, and about 13,150 will die of these cancers. [1]
Who is at higher risk?
Tobacco in any form, including cigarettes, cigars, pipes, chewing tobacco and e-cigarettes
Heavy alcohol use, especially combined with tobacco
HPV infection, which causes many cancers of the oropharynx
Age, with most cases in people over 40
Sun exposure, for cancer of the lip [2]
HPV-related throat cancer often occurs in people who have never smoked. Most HPV infections clear on their own, and only a small share of people go on to develop cancer. The HPV vaccine protects against the virus types most often linked to these cancers. Ask your physician whether it is right for you or your children.
What does an oral cancer exam involve?
An oral cancer exam is quick and painless. The dentist or hygienist looks at and feels your lips, cheeks, tongue, floor and roof of the mouth, and throat, and feels the neck and under the jaw for lumps. [2] If something looks unusual, the next step may be a recheck in two weeks or a biopsy, depending on what is found. Only a biopsy can confirm or rule out cancer. Read about how oral cancer screening works at our office.
Which changes should you have checked?
See a dentist or physician if any of these last more than two weeks:
A sore or ulcer that doesn't heal
A red or white patch
A lump or thickening in the mouth or on the neck
Ongoing sore throat, hoarseness or trouble swallowing
Numbness of the tongue or lip
Our post on the warning signs of mouth cancer explains each one and how to check your own mouth.
Where can you get an oral cancer exam in Jacksonville?
If you are due for an exam or have noticed a change, contact our office or call 904-398-1549. If cancer is diagnosed, we coordinate dental care with your medical team before and during treatment. Learn more about dental care around head and neck cancer.
Sources
American Cancer Society. Key statistics for oral cavity and oropharyngeal cancers. Last revised March 23, 2026. Estimates based on Cancer Facts & Figures 2026.
National Institute of Dental and Craniofacial Research. Oral cancer. Retrieved October 6, 2026.
Oral Cancer Foundation. April is Oral Cancer Awareness Month.
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.