There is no definite time in the clinic on how long teeth rubbing against the tongue can cause cancer. Whether or not tongue cancer will develop varies from person to person. Usually, teeth rubbing against the tongue will not cause tongue cancer. Tongue cancer is often caused by bad restorations or sharp tooth remnants or tips that chronically irritate the edge of the tongue for a long time. In addition, poor oral hygiene, alcohol and tobacco addiction, local trauma to the mouth and habitual betel nut chewing are also risk factors for malignant lesions of the tongue mucosa. However, usually, teeth rubbing against the tongue will not cause tongue cancer after active and effective treatment. Meanwhile, in daily life, one should eat regularly, pay attention to oral hygiene, rinse mouth with salt water or mouthwash in time after meals, avoid smoking and alcohol, and develop good living habits.