<unk>  is a descriptive term for the appearance of the tongue when there are indentations along the lateral borders (the sides), as the result of compression of the tongue against the adjacent teeth. The oral mucosa in the area of crenation is usually of normal color, but there may be erythema (redness) if exposed to a high degree of friction or pressure.<unk>  is usually asymptomatic and harmless. It is not a disease as such, but usually results from habits where the tongue is pressed against the lingual surfaces (the side facing the tongue) of the dental arches, or from any cause of macroglossia (enlarged tongue), which in itself has many causes such as Down syndrome. Where crenation is caused by parafunctional habits, there may also be associated bruxism, linea alba, or morsicatio buccarum.
Crenated tongue
Fissured tongue
Black hairy tongue
Hemifacial hypertrophy
Spotted lunulae
Chattering teeth
Palatal myoclonus
Ankyloglossia