When you find a hole on the surface of the tooth, and there is a foul odor, it means that the tooth has undergone caries, and must be treated as early as possible, the treatment should first determine whether it is simple caries, or has developed into pulpitis and periapical inflammation. For simple caries, only need to remove the carious material thoroughly, the application of filling materials to repair the cavity on the can; but for pulpitis and periapical inflammation, must be taken to root canal surgery, root canal surgery is mainly through mechanical and chemical means, will be infected with the pulp tissue completely clean, and then filled with aseptic gum tip class plugging material, after which the dental crown repair is completed.