Causes
Mouth cancers form when cells on the lips or in the mouth develop changes (mutations) in their DNA. A cell’s DNA contains the instructions that tell a cell what to do. The mutations changes tell the cells to continue growing and dividing when healthy cells would die. The accumulating abnormal mouth cancer cells can form a tumor. With time they may spread inside the mouth and on to other areas of the head and neck or other parts of the body.
Mouth cancers most commonly begin in the flat, thin cells (squamous cells) that line your lips and the inside of your mouth. Most oral cancers are squamous cell carcinomas.
It’s not clear what causes the mutations in squamous cells that lead to mouth cancer. But doctors have identified factors that may increase the risk of mouth cancer.
Risk factors
Factors that can increase your risk of mouth cancer include:
· Tobacco use of any kind, including cigarettes, cigars, pipes, chewing tobacco and snuff, among others
· Heavy alcohol use
· Excessive sun exposure to your lips
· A sexually transmitted virus called human papillomavirus (HPV)
· A weakened immune system
Prevention
There’s no proven way to prevent mouth cancer. However, you can reduce your risk of mouth cancer if you:
· Stop using tobacco or don’t start. If you use tobacco, stop. If you don’t use tobacco, don’t start. Using tobacco, whether smoked or chewed, exposes the cells in your mouth to dangerous cancer-causing chemicals.
· Drink alcohol only in moderation, if at all. Chronic excessive alcohol use can irritate the cells in your mouth, making them vulnerable to mouth cancer. If you choose to drink alcohol, do so in moderation. For healthy adults, that means up to one drink a day for women of all ages and men older than age 65, and up to two drinks a day for men age 65 and younger.
· Avoid excessive sun exposure to your lips. Protect the skin on your lips from the sun by staying in the shade when possible. Wear a broad-brimmed hat that effectively shades your entire face, including your mouth. Apply a sunscreen lip product as part of your routine sun protection regimen.
See your dentist regularly. As part of a routine dental exam, ask your dentist to inspect your entire mouth for abnormal areas that may indicate mouth cancer or precancerous
Source https://www.mayoclinic.org/diseases-conditions/mouth-cancer/symptoms-causes/syc-20350997?p=1