Darkening of the tongue may be caused by hyperplasia and hyperkeratosis of filiform papillae on the surface of the tongue, or it may be physiologically normal. Different treatments are taken according to different causes. Common therapeutic drugs for black tongue caused by pathology include retinoic acid, vitamin B and penicillin. They are used to promote keratolysis, mucosal tissue recovery, and anti-infection, respectively. Common surgical treatments for pathologically caused black tongue include laser surgical treatment and current surgical treatment. Laser treatment is to use carbon dioxide light-emitting tube to shoot out high-power light to irradiate the lesion tissue, so that the inflammation is absorbed, and the low power can remove spots and beautify the skin. Current therapy is a treatment method with the coagulation as well as cauterization effect of high frequency current, which can produce a thermal reaction in the tissues through electric current. Physiological causes such as consuming foods or drugs containing melanin or excessive smoking when the tongue will also become black, at this time there is no need to take medication to treat. If you find a black tongue, you should seek medical attention in a timely manner and treat it under the guidance of a doctor, and should not take medication without authorization. Maintain a healthy diet, pay attention to oral hygiene, and quit smoking and drinking.