In daily life and work, people are in contact with metal almost every day, and occasionally metal poisoning occurs. If early attention can be paid to the lesions occurring in the oral cavity, it can be roughly known whether metal poisoning occurs or what kind of metal poisoning is occurring, so that timely medical treatment can be sought. However, due to the characterization of the non-unique, many diseases can appear in the following a variety of manifestations, so do not be too nervous, too nervous, if in doubt, must go to the hospital to confirm the examination, so as not to misunderstand the impact of their own health and life! First, lead poisoning: oral mucosa whitening of the mouth may have astringent feeling and metallic taste, thirst, burning and irritation of the throat pain, salivation. It can also be seen in the buccal mucosa, oral mucosa in a band-shaped or irregular plaque or blue-gray microdots. Antimony poisoning: metallic taste in the mouth, thirst, salivation, pain in the oral cavity and throat, swelling of the lips, inflammation of the oral cavity, dark blue gum margin. Zinc poisoning: metallic taste in the mouth, dryness and burning sensation in the throat, hoarseness and even loss of voice. Barium poisoning: dry mouth and foul taste, burning sensation in the mouth, salivation. Mercury poisoning: inflammation or ulceration of the mouth, yellow teeth, salivation. Gold poisoning: inflammation of mouth, tongue, throat and gums. Thallium poisoning: dry and painful mouth, inflammation, hemorrhage of mucous membranes, ulceration of gums.