Oral cancer is highly survivable when caught early - but easy to miss. This 5-minute home self-exam is a useful complement to your twice-yearly professional screening.
Risk factors you can change
The strongest oral-cancer risk factors are also the most modifiable:
- Tobacco use (cigarettes, cigars, pipes, chewing tobacco, snuff) - increases risk 5-10×.
- Heavy alcohol use - independently increases risk; combined with tobacco the risk multiplies (not just adds).
- HPV-16 infection - now the most common cause of oropharyngeal cancers in younger non-smoking adults. The HPV vaccine is highly protective and is recommended through age 45.
- Sun exposure to the lips - adds lip-cancer risk, especially in outdoor workers in California.
- Poor diet - low fruit and vegetable intake correlates with higher oral cancer rates.
Reducing any one of these meaningfully drops your risk.
Risk factors you can't change (but should know)
- Age over 40 - most cases occur in patients 40+.
- Male sex - historically higher rates, narrowing as women's tobacco rates equalize.
- Genetic predisposition - Fanconi anemia and dyskeratosis congenita raise risk.
- Prior cancer history in the head/neck.
- Compromised immune system (organ transplant, HIV, autoimmune therapy).
These do not mean cancer is inevitable - they mean professional screening matters more, and self-exams should be more frequent.
How to do a 5-minute home self-exam
Once a month, after brushing, in good light:
- Lips: Pull lower lip down, inspect inside surface and gum line. Repeat upper. Look for sores, lumps, white/red patches.
- Cheeks: Use a finger to gently pull each cheek out. Look at the inside surface for the same signs.
- Gums: Inspect all surfaces, looking for changes in color, especially red or white patches.
- Tongue (top): Stick out tongue, look at top surface in the mirror. Lift to inspect underside - a high-risk area.
- Floor of mouth: Look at the floor of the mouth under the tongue.
- Roof of mouth: Tilt head back, look at hard palate.
- Throat: Say "ahh" and look at the back of the throat for asymmetry or color changes.
- Lymph nodes: With fingertips, gently press along the underside of your jaw, behind the ears, and down the sides of your neck. Lumps or tenderness should be checked.
What to look for - warning signs
Common early warning signs:
- A sore that doesn't heal in 2 weeks
- A white patch (leukoplakia) that cannot be scraped off
- A red patch (erythroplakia) - these are statistically more concerning than white patches
- A mixed red-and-white patch
- A persistent lump or thickening in the lip, cheek, or gum
- Numbness anywhere in the mouth or lip
- Difficulty chewing, swallowing, or moving the tongue
- A persistent sensation of something stuck in your throat
- Loose teeth without periodontal cause (rare but serious)
- Hoarseness lasting more than 2 weeks
Most of these are NOT cancer - they are usually irritation, canker sores, or fungal infections - but any of them lasting more than 14 days deserves a professional look.
When and how dentists screen
At Stephen Cheung DDS, an oral cancer screening is part of every routine exam and cleaning. The screening includes a visual inspection of all the surfaces above, palpation of lymph nodes, and a check of how your tongue and jaw move. If anything looks suspicious, we will document with a photograph, recommend a 2-week recall to see if it resolves, or refer you for a biopsy. Early-stage oral cancer has a 5-year survival rate of 80-90%; late-stage drops to under 40%. The screening is free, takes 90 seconds, and is one of the most consequential parts of your visit.
Frequently asked questions
- Are HPV-related oral cancers preventable?
- Largely yes. The HPV vaccine (Gardasil 9) is highly protective and is recommended through age 45. It is most effective before any HPV exposure. Talk to your physician about whether the vaccine makes sense for you.
- How often should I do a self-exam?
- Once a month is plenty. Pair it with another monthly habit (e.g., the 1st of each month) so you remember.
- I have a sore that's been there for 4 days - should I worry?
- Probably not. Most canker sores, traumatic ulcers, and viral lesions resolve within 7-14 days. Any sore lasting more than 2 weeks should be evaluated.
- Does mouthwash cause oral cancer?
- There is no strong, consistent evidence linking commercial mouthwash to oral cancer. Some early studies raised concern about high-alcohol mouthwashes, but more recent data has not confirmed an independent risk. If you are worried, switch to an alcohol-free formulation.