Root canal therapy is a good method to treat oral diseases, which has a good therapeutic effect on periodontitis and pulpitis, but some patients don't know much about it. Experts from Beijing Liang Ya Stomatological Center will answer your questions. According to experts, the filling materials for root canal therapy can be divided into solid type and paste type according to their characteristics, including gutta percha tip, silver tip and plastic tip. This kind of root canal filling material can not completely fill the root canal, so it should be used with root canal paste. The main component of root canal paste is zinc oxide, which is non-toxic. The material used to fill the cavity is generally polymer, also known as resin material, which is also non-toxic and harmless. There are many kinds of paste-type root canal filling materials, such as calcium hydroxide and its preparation, new zinc paste containing trioxymethylene, iodoform paste, zinc oxide clove oil cement and so on. What is the filling material for root canal therapy? Doctors will choose filling materials according to the specific conditions of patients' teeth and the requirements of patients. Root canal filling is beyond the ability of ordinary doctors, and patients must go to professional plastic surgery hospitals when performing root canal treatment. Root canal therapy is an important step to fill root canals and materials, which is beyond the competence of ordinary doctors. Then some patients will still have toothache after root canal treatment. What happened? The causes of pain after infected root canal surgery are well understood, and the causes of pain after vital pulp root filling are caused by improper operation in treatment. Using instruments smaller than the diameter of root canal to prepare root canal can not remove pulp, but can only split, and broken tissue will cause pain. With proper treatment, the pain can go away. Proper root canal preparation can reduce pain.