A thickened whitish line on the buccal mucosa at the level of the occlusal plane extending from the corners of the mouth to the posterior teeth. It is usually associated with the frictional activity of the teeth and may be accentuated by cheek biting or parafunction. The appearance is caused by a keratosis of the epithelial tissue which cannot be rubbed off. It is asymptomatic and is usually present bilaterally. Linea alba buccalis is frequently associated with a crenated tongue which may be a sign of bruxism. The condition does not require treatment.