Oral Cancer Screening: What Happens and Why It Matters

By Lovik Mirzaeian, DDS. Updated November 2026.

An oral cancer screening is a short visual and hands-on check of your lips, tongue, cheeks, palate, floor of the mouth, throat and neck, done at your routine dental exam to catch suspicious changes early. It takes about two minutes, it does not hurt, and most patients do not even realize it has happened. It matters because oral cancer found early is far more treatable than oral cancer found late, and the mouth is one of the few places where a trained person can simply look.

Most patients never ask about it, so here is what we are doing while you sit with your mouth open.

What the Screening Actually Involves

First I look. I check the lips inside and out, then use a mirror and gauze to pull the tongue gently to each side so I can see the sides and underside, which are the places most often affected. I look at the floor of the mouth under the tongue, the roof of the mouth, the inside of both cheeks, the gums, and the back of the throat and tonsils.

Then I feel. I press along the floor of the mouth with one finger inside and one outside, run my fingers along the sides of the tongue, and feel the neck under the jaw and down each side for enlarged lymph nodes. Firmness, a lump, or a spot that feels different from the tissue around it gets a closer look.

What we are looking for

The classic signs are a white patch, a red patch, a mixed red and white patch, an ulcer or sore that has not healed in two weeks, a lump or thickening, a rough or crusted area, or a spot that bleeds easily without a reason. Numbness, difficulty swallowing, a persistent sore throat on one side, and a change in voice also count, so I ask about them.

Most of what I find is harmless. A bitten cheek, a burn from hot pizza, a canker sore, a fold of tissue rubbed by a denture. The point of the screening is not to alarm anyone. It is to notice the one in many that is not harmless and to notice it early.

Why Two Weeks Is the Number to Remember

Almost every benign sore in the mouth heals within two weeks. A canker sore, a bite, a scald, a scrape from a chip all resolve in that window. So the rule is simple: anything in your mouth that is still there after two weeks needs to be looked at, even if it does not hurt. Especially if it does not hurt, because early oral cancer is usually painless. If you are not sure what a sore is, our guide on how to tell a canker sore from a cold sore covers the common ones.

Who Is at Higher Risk

Tobacco in any form is the biggest risk factor, including cigarettes, cigars, pipes, and chewing tobacco, on top of what smoking and vaping do to your gums. Heavy alcohol use is the second, and the two together multiply each other. The human papillomavirus, HPV, is now a major cause of cancers at the back of the throat and tonsils, and those patients are often younger, nonsmokers, and otherwise healthy. Sun exposure raises the risk of lip cancer for people who work outdoors. Age matters, with most cases appearing after 40.

That said, a share of people who develop oral cancer have no obvious risk factor at all. That is why we screen everyone, not just smokers.

Why Early Detection Changes the Outcome

Small, early lesions can often be removed with limited surgery and a good chance of cure. Lesions that have grown into deeper tissue or spread to the lymph nodes in the neck need larger surgery, radiation, sometimes chemotherapy, and the results are worse. The difference between the two is usually time. A patch spotted at a routine cleaning is caught long before it would have caused pain, and that gap matters more than almost anything else.

The American Dental Association has a plain summary of the signs and risk factors if you want to read further.

What Happens If We Find Something

Usually, the first step is to remove any obvious cause, such as a sharp tooth edge or a rough denture, and have you back in two weeks to see whether the spot has healed. Most have. If it has not, or if it looked worrying from the start, I refer you to an oral surgeon or an ear, nose and throat specialist for a biopsy. A biopsy is a small sample taken under local anesthetic and sent to a lab. It is the only way to know for certain what a lesion is. I will not guess and I will not tell you not to worry until the lab has answered.

Checking Yourself at Home

Once a month, in good light, look at your lips, pull your cheeks out, stick your tongue out and look at the top, then lift it to see the underside and the floor of the mouth. Feel along your neck and under your jaw. You are looking for anything new that was not there last month. You do not need to be an expert, just familiar enough with your own mouth to notice a change and mention it.

If you wear a denture, take it out to do this. Dentures cover exactly the tissue that needs checking.

When to See a Dentist

Come in promptly, not at your next scheduled visit, if you have a sore or patch that has lasted more than two weeks, a lump in the mouth or neck, unexplained bleeding, numbness of the lip or tongue, trouble swallowing, or a hoarse voice that is not going away. For everyone else, the screening is built into every routine exam we do, which is one more reason to keep those visits on the calendar even when nothing hurts. If you smoke or drink heavily, tell us, because we will look harder and ask you to come more often.

Frequently Asked Questions

How often should you get an oral cancer screening?

At every routine dental exam, which for most adults means twice a year. People who use tobacco, drink heavily, or have had a previous oral cancer should be checked more often, and should not wait for a scheduled visit if they notice a change.

Does an oral cancer screening hurt?

No. It is a visual check plus gentle pressure with gloved fingers on the tongue, floor of the mouth, and neck. It takes about two minutes and needs no instruments beyond a mirror and a piece of gauze to hold the tongue.

What does early oral cancer look like?

Most often a flat white or red patch, a sore that will not heal, or a small firm lump, usually on the side or underside of the tongue, the floor of the mouth, or the lip. It is usually painless in the early stages, which is why a persistent spot should be checked even if it does not bother you.

Can a dentist tell if a mouth sore is cancer?

A dentist can tell whether a spot looks suspicious and whether it has lasted too long to be a simple sore, but only a biopsy examined in a lab can say for certain. Any sore that is still present after two weeks should be examined, and a suspicious one will be referred for biopsy.

Noticed a Spot That Will Not Heal? Dr. Mirzaeian Can Help

A two-week-old sore is worth a two-minute look. Please contact us to set up a consultation and we will examine it, explain what we see, and refer you for a biopsy if one is needed.

Lovik Mirzaeian, DDS has achieved extensive training in multidisciplinary dental treatments. His credentials include Dental Implants, Cosmetic Dentistry, Full Mouth Reconstruction, Endodontics, Oral Surgery, Orthodontics, and Sleep Sedation. Our office puts your comfort and smile first, and we are dedicated to giving you top-notch dental care. Get ready to show off your perfect smile!

Looking for a trusted family dentist in Clovis? Dr. Mirzaeian welcomes new patients of all ages.