A bilateral, asymptomatic white horizontal line on the buccal mucosa at the level of the occlusal plane is:

Linea alba is a common benign line of frictional/pressure keratosis along the buccal mucosa at the occlusal plane, corresponding to the teeth. It is asymptomatic and needs no treatment.Other options: Leukoplakia is a non-scrapable white patch of uncertain cause needing evaluation; lichen planus shows Wickham striae or erosions; candidiasis wipes off and is fungal.Key exam takeaway: A bilateral white line at the occlusal plane is linea alba (benign frictional keratosis); reassure.