Bad teeth are mostly indicative of oral problems, with problems such as gingivitis, periodontitis, and dental caries. However, some of the oral abnormalities are caused by diseases other than oral, such as long-term bleeding gums, oral mucosal ulcers, toothache, etc.. 1. Gingivitis: Long-term accumulation of plaque on the tooth surface can cause gingivitis, which can appear as bleeding from brushing, and changes in the shape, color and texture of the gums. Plaque, tartar and other irritants can be removed by scaling, and antibacterial mouthwash can be used, such as 0.12% to 0.2% chlorhexidine. 2. Periodontitis: calculus can irritate the gums, leading to periodontitis, bad breath, bleeding, red and swollen gums and other symptoms. It is necessary to remove the calculus in time. 3. Dental caries: It is the destruction of hard tissue of the teeth caused by bacterial infection and other factors, and the emergence of cavities, which is sensitive to external stimuli and has the symptoms of acidity and pain. It can be filled with 75% sodium fluoride glycerin paste and silver ammonium fluoride as prescribed by the doctor, and silver amalgam filling and inlay restoration can be performed. 4. Oral symptoms caused by diseases other than oral cavity: bleeding gums may be caused by blood system diseases, persistent mouth ulcers may be the oral manifestation of leukemia or syphilis, and some patients with heart attack will have toothache. It is recommended that people with the above problems should go to the hospital in time to identify the causes and receive appropriate treatment.