The darkening of the upper chamber of the mouth (palate) may be a physiological phenomenon, or it may be caused by exogenous pigmentation, oral ulcers, and should be promptly consulted to find out the cause of the disease. 1. Physiological phenomenon: the blackening of the upper chamber of the mouth may be due to the increase of various pigments in the gingival melanin and hemoglobin naturally caused by the increase in the gingival melanin and hemoglobin, is not pathologic and does not require treatment, usually do a good job of oral and dental cleanliness. 2. Exogenous pigmentation: the black upper chamber of the mouth may also be caused by exogenous pigmentation, may also be caused by the absorption of heavy metals through the blood, such as long-term smoking, drinking strong tea and do not pay attention to oral hygiene and cleanliness of the patient, teeth and upper chamber surface is easy to have smoke stains, stains and other adhesion. The phenomenon of blackening. 3. Oral ulcers: the blackening of the upper chamber of the mouth may also be caused by oral ulcers, oral ulcers in the form of herpes, coupled with the observation of the lack of light in the oral cavity, may make the patient to see the symptoms of the upper palate of the oral cavity with black patches. It is important to note that the symptom of darkening of the upper chamber of the mouth should be seen promptly by a doctor to clarify the cause of the condition and treat accordingly if necessary.