Dentists are trained to spot oral cancer during regular checkups, often catching warning signs before patients even realize something is wrong. Nearly 10,000 people were diagnosed with oral cancer in England last year alone, representing a 37% increase over just one decade and more than double the number recorded a generation ago . Yet surveys show that only one in ten British adults perform the monthly oral cancer self-checks recommended by doctors, and many people aren't seeing a dentist regularly enough to catch early-stage disease.

The good news: your dentist has tools and training you don't. They can identify suspicious changes in your mouth during routine appointments, sometimes before you've even noticed anything unusual. Understanding what these early warning signs look like, and what symptoms might appear before you open your mouth at all, could literally save your life.

What Are the Five Key Signs of Oral Cancer Your Dentist Looks For?

Dr. Safa Al-Naher, Founder and Principal Dentist at Serene by Dr. Safa in Knightsbridge, London, outlined the five main visual indicators dentists screen for during routine checkups :

• A lump in your mouth: Any unusual growth or bump inside the oral cavity that wasn't there before.
• A mouth ulcer lasting more than three weeks: Sores that don't heal within the typical timeframe are a red flag worth investigating.
• Unexplained bleeding in your mouth: Bleeding that occurs without an obvious cause like aggressive brushing or injury.
• Red or red and white patches: Discolored areas on the gums, tongue, or inside the cheeks that persist.
• Loose teeth or dentures that no longer fit properly: Changes in tooth stability or denture fit can signal underlying bone or tissue changes.

But not all warning signs are visible inside the mouth. A lump or sore on your lip that doesn't heal after a couple of weeks, or enlarged lymph nodes in your neck, are also possible symptoms that warrant professional evaluation.

What Symptoms Can Appear Before You Even Say "Ahh"?

Two particularly important warning signs can indicate oral cancer even before a dentist looks inside your mouth.

"These are difficulties with your speech," explained Dr. Al-Naher. "You may sound hoarse or quieter, or you may slur your words. And pain in your ear. This can be caused by damage to a nerve near your tongue."

Dr. Safa Al-Naher, Founder and Principal Dentist at Serene by Dr. Safa

Additional symptoms that shouldn't be ignored include a sore throat that persists for weeks without improvement, difficulty or pain when chewing or swallowing, difficulty moving your jaw, and numbness of your lip or another part of your mouth . These changes in function or sensation can be subtle, but they're important enough to mention to your doctor or dentist.

How Can You Perform a Monthly Oral Cancer Self-Check at Home?

While professional screening is essential, you can also conduct a simple two-minute self-examination once a month. According to Dr. Natasha Fernando, a GP and Medical Director at Medichecks, all you need is a mirror, good lighting, and clean hands .

Dr. Natasha Fernando

• Examine your face and neck: Look at your skin and feel your neck muscles, keeping an eye out for any swelling or unusual lumps.
• Inspect your lips, gums, and cheeks: Look for any sores, color changes, or unusual textures on these surfaces.
• Check your tongue, floor of mouth, and roof: Feel inside your mouth with your fingers and look for anything that feels or looks different from normal.
• Contact your dentist if concerned: If you notice anything unusual, don't wait for your next scheduled appointment; reach out to your dental professional right away.

The bathroom is the ideal location for this check because it typically has good lighting and a mirror. Performing this simple routine monthly could catch changes early, when treatment is most effective.

What Are the Main Risk Factors for Developing Oral Cancer?

Understanding your risk factors can help you stay vigilant. Tobacco use remains one of the biggest risk factors, but recent research has raised concerns about vaping. Dr. Al-Naher noted that she's seeing increasingly unusual patches in the mouths of patients who vape, with brown or yellow discoloration similar to what appears in cigarette smokers . Additionally, vaping appears to interfere with mouth healing after dental extractions.

Other significant risk factors include heavy alcohol consumption, exposure to intense sunlight or sunbeds (which can affect the lips), a weakened immune system, previous cancer diagnosis, and certain types of human papillomavirus (HPV) infection. A recent study also found that sugary drinks can increase your risk of mouth cancer by five times . Drinking extremely hot beverages regularly can also increase risk if the repeated heat exposure prevents tissues from healing properly.

What Three Steps Can Help Lower Your Oral Cancer Risk?

The most effective prevention strategies are straightforward :

• Don't smoke: Avoiding tobacco products, including cigarettes, chewing tobacco, betel nut, and paan, significantly reduces your risk.
• Limit alcohol consumption: Keep drinking within recommended guidelines to reduce your cancer risk.
• Eat a Mediterranean-style diet: Focus on fresh vegetables (particularly tomatoes), citrus fruits, olive oil, and fish, which provide protective nutrients and antioxidants.

Regular dental checkups are equally important. The British Dental Association has emphasized that opportunities to spot oral cancer early are being missed when people don't see a dentist regularly . Dentists are trained to recognize subtle changes that might escape your notice, making routine appointments a critical part of your cancer prevention strategy.

Early detection and treatment significantly improve survival rates for oral cancer. If you notice any of the warning signs described here, don't delay in contacting your dentist or doctor. A two-minute self-check each month, combined with regular professional dental visits, gives you the best chance of catching any problems early.