The oral surfaces covered in keratinized epithelium include the hard palate, the dorsal surface, or top, of the tongue, and the gingiva.

口腔表面由角化上皮覆盖的结构包括硬腭、舌的背侧面（或上面）与牙龈。

The oral surfaces covered by non-keratinized stratified squamous epithelium include the buccal mucosa, the floor of the mouth, the lateral and ventral (or bottom) surfaces of the tongue, the soft palate, and the retromolar trigone.

口腔表面由未角化的复层鳞状上皮覆盖的结构，包括颊黏膜、口底、舌的侧面和腹侧（或底面）、软腭与磨牙后三角。