Almost everyone develops a mouth sore at some point. A canker sore, a cheek bite, or irritation from hot food can leave a tender spot that makes eating uncomfortable. In most cases, these sores heal within a week or two. But when a sore lingers longer than expected, it’s important not to ignore it.
At California Dental Group, we evaluate persistent oral lesions carefully because while many sores are harmless, some require prompt attention.
Common Causes of Temporary Mouth Sores
Most mouth sores fall into predictable, short-term categories.
Canker Sores (Aphthous Ulcers)
These small, round ulcers often have a white or yellow center with a red border. They are not contagious and usually heal within 7–14 days. Stress, minor injury, or certain foods may trigger them.
Accidental Trauma
Biting your cheek, irritation from braces, or sharp edges on a tooth can create a sore that typically improves once the irritation is removed.
Burns from Hot Food
“Pizza burns” on the roof of the mouth are common and generally heal within several days.
Cold Sores
Caused by the herpes simplex virus, cold sores typically appear on the lips or just outside the mouth and heal within two weeks.
In these cases, discomfort improves gradually and healing is noticeable.
When a Sore Becomes Concerning
A mouth sore should be evaluated if it:
- Lasts longer than two weeks
- Continues to grow in size
- Bleeds easily
- Feels firm or raised
- Causes numbness
- Is accompanied by difficulty swallowing
Unlike minor irritation, concerning lesions often do not improve over time.
Why Timing Matters
The two-week guideline is important because healthy oral tissue regenerates quickly. Most minor injuries heal within that window. If a sore persists beyond two weeks without improvement, it deserves closer examination.
Persistent sores can sometimes be linked to:
- Chronic irritation
- Underlying infection
- Immune-related conditions
- Oral cancer (in rare cases)
Early evaluation dramatically improves outcomes when more serious conditions are involved.
What an Oral Cancer Screening Involves
At California Dental Group, routine exams include a visual and physical oral cancer screening. This involves:
- Examining the tongue, cheeks, gums, and palate
- Checking under the tongue and along the floor of the mouth
- Feeling for lumps or unusual tissue changes
- Assessing lymph nodes in the neck
Most screenings are quick and painless. If something appears abnormal, further testing or referral may be recommended.
Risk Factors That Increase Concern
Certain factors raise the risk of serious oral lesions, including:
- Tobacco use
- Heavy alcohol consumption
- HPV exposure
- Prolonged sun exposure (for lip lesions)
- A history of oral cancer
However, it’s important to note that oral cancer can occur even without obvious risk factors.
Monitoring at Home
If you notice a sore, you can monitor it by:
- Taking a photo to track changes
- Avoiding spicy or acidic foods
- Keeping the area clean
- Watching for signs of healing
If it improves steadily within two weeks, it is likely minor. If not, schedule an evaluation.
When in Doubt, Get It Checked
Most mouth sores are harmless and temporary. Still, persistent changes in oral tissue should never be dismissed.
If you have a sore that hasn’t healed or something in your mouth that “just doesn’t feel right,” call California Dental Group at 800-407-0161 to schedule an exam. Early evaluation provides reassurance — and when necessary, early treatment.
