A simple two-week rule: any oral symptom that hasn't resolved in 14 days warrants a professional look. Here are the specific symptoms that should prompt a same-week call.
The two-week rule
Most oral lesions - canker sores, traumatic ulcers, viral lesions, fungal infections - heal within 7-14 days. The two-week rule is simple: any sore, patch, or lump still present at day 14 warrants a professional evaluation. This rule is endorsed by the American Cancer Society and the American Dental Association. It is not a guarantee of cancer; the great majority of two-week-plus lesions are benign. But it is the single best filter for catching the rare lesion that turns out to be malignant.
White and red patches
- Leukoplakia (white patch): A white plaque that cannot be scraped off. About 5-25% turn malignant over years. Common locations: cheek lining, side of tongue, floor of mouth.
- Erythroplakia (red patch): A bright-red velvety patch. About 50% are pre-cancerous or already cancerous when biopsied - much more concerning than leukoplakia.
- Mixed red-and-white (erythroleukoplakia): Carries the highest cancer risk of the three.
Any of these warrant a dental visit within a week. We typically photograph the lesion, recommend a 2-week recall to see if it resolves, and refer for biopsy if it persists.
Lumps, thickenings, and asymmetry
Visual changes worth attention:
- A palpable lump or thickening anywhere in the lips, cheeks, gums, tongue, or floor of mouth
- Tonsil asymmetry - one tonsil noticeably larger than the other in an adult
- A persistent neck lump under the jaw or down the side of the neck (often the first sign of HPV-related throat cancer)
- A new firm, fixed area that does not move when you push on it (very different from soft, mobile fatty lumps)
Any of these lasting more than 2-3 weeks should be evaluated, even without pain.
Functional changes - numbness, voice, swallowing
Cancer can sometimes show up as a change in function before it shows visually:
- Numbness in the lip, tongue, or cheek - particularly when not associated with a recent dental procedure
- A persistent lisp or change in voice lasting more than 2 weeks
- Difficulty swallowing that persists
- A persistent sense of something stuck in the throat (globus sensation)
- One-sided ear pain with no obvious ear infection
- Unexplained weight loss combined with any of the above
These deserve same-week evaluation.
What happens at the visit
When you call about a suspicious lesion, we typically:
- Schedule a focused exam within 1-3 days.
- Visually inspect and palpate the area.
- Photograph the lesion for the chart and for comparison at recall.
- Take a panoramic X-ray if bone involvement is possible.
- Recommend either a 2-week recall (if the lesion looks likely benign) or a referral to an oral surgeon for biopsy.
- Document your tobacco, alcohol, and HPV-vaccine status for the chart.
A biopsy is a brief in-office procedure under local anesthesia. Pathology results typically return in 5-7 days.
Frequently asked questions
- I have a canker sore - is that an emergency?
- Almost never. Most canker sores resolve within 7-14 days. Apply over-the-counter topical numbing gel, avoid acidic foods, and re-check at day 14. If still present, schedule a visit.
- I had a tooth pulled and have numbness in my chin - is that cancer?
- Almost certainly not. Some numbness after extractions (especially lower wisdom teeth) is a known temporary effect of nerve irritation and usually resolves over weeks. New, unexplained numbness without a procedure is the type that deserves attention.
- How long does a biopsy take?
- The biopsy itself takes 15-30 minutes under local anesthesia. Recovery is straightforward - soft diet for a day or two. Pathology results come back within a week.
- Will insurance cover the screening and any biopsy?
- Routine oral cancer screenings at recall visits are covered as part of your standard exam. Biopsies, when needed, are usually billed to medical insurance and are typically covered when there is a documented suspicious lesion.