A filling, also known as a dental filling, is a treatment for tooth decay. Usually shallow caries do not hurt, but if the pulp is involved, there may be soreness and discomfort. Usually when shallow caries occurs, it is only on the surface of the enamel, and the filling will not be felt too much, and usually will not feel pain. Caries failure to fill the cavity in time, has developed to the deep layer of dentin. This time is closer to the nerves of the tooth, when removing the decay with a drill, there may be soreness and discomfort, but generally can be tolerated. Individual cases of sensitivity can also be performed under local anesthesia. Dental fillings are routine operations in dentistry, no need to panic about toothache, patients are advised to go to a professional hospital for treatment. At present, the clinical use of painless treatment methods, there will be no pain in the filling of teeth.