Burning mouth syndrome (Burning mouth syndrome BMS) and atypical toothache/ atypical odontalgia (AO) were belong to the kind of chronic facial pain syndrome with unexplained episodes. There is no signs of organic pathosis or anatomical lesions clinically. It is a challenge and trouble for the dentist to make the diagnosis and treatment. In this case, in addition to discussion for different clinical diagnosis and treatment, we use the occlusal bite splint combined with drug and psychological support for the treatment. I found surprising different result, because patient had suffering from temporomandibular joint disorder.