If the teeth become black after iron supplementation, the recovery methods are as follows: 1. stop taking drugs. 2. polishing treatment or timely brushing: can be effectively improved, the teeth become black after iron supplementation, it may be the pigment deposited on the tooth surface, through polishing treatment can be effectively relieved. 3. whitening: if it causes deep tooth coloring, later need to take the whitening method to treatment. In the case of more serious patients, porcelain veneers are needed for restorative treatment. Therefore, as far as possible, use a straw for iron intake to avoid contact with the teeth and cause problems. If after contact, timely oral rinsing and brushing can effectively avoid iron deposition on the surface of the teeth, which can cause the darkening of the teeth.