Typical symptoms of oral mucosal fibrosis include pale, mildly opaque oral mucosa, loss of capillary blood color, hardness to palpation, difficulty in accessing needles, decreased mouth opening, and less than three fingers. It is usually clear based on the subjective judgment of the physician. Fibrosis occurs wherever there are oral mucosal fibers and it is a homogeneous whole. In contrast, other mucosal diseases such as leukoplakia and lichen planus are soft to touch, mostly in small areas such as the tongue and palate, without symptoms such as dental closure, restricted mouth opening, or difficulty in swallowing, and are easy to differentially diagnose from them.