What is a white, scalloped line on the buccal mucosa at the level of the occlusal plane?

Linea alba is a benign, asymptomatic white line that forms along the buccal mucosa exactly at the occlusal plane, caused by frictional/chronic low-grade trauma from the adjacent teeth (and sometimes mild sucking/chewing habits). Lichen planus typically shows a reticular/lace-like pattern (not a single line at the occlusal plane), white sponge nevus is diffuse and bilateral, and leukoedema produces a more generalized greyish-white filmy appearance that disappears when the mucosa is stretched.