Contraindications for dental fillings include prohibition of fillings in case of oral inflammation and avoiding food for two hours after the filling, including both before and after the filling. Dental fillings are used to repair dental defects with artificial filling materials. Any loss of dental tissue due to trauma, wedge-shaped defects, caries, etc. needs to be repaired, including the preparation of cavities and filling two steps. Before filling, the doctor will examine the patient’s mouth and make a filling plan according to the number of caries and the degree of lesions. There are some contraindications and precautions before and after filling, including: 1. Before filling: (1) Dental fillings and restorations should be timely and early. (2) Should choose formal, professional dental institutions. (3) If there is inflammation and other related lesions in the oral cavity, or even cause periapical disease, it should be treated first, and then fill the tooth after cure. 2. After filling: (1) Do not brush your teeth on the day when the filling material is resin. (2) Food should be avoided within 2 hours after filling; hard food should not be chewed after filling. (3) After the filling should pay attention to good oral hygiene, regular oral examination. (4) If there is pain after filling further aggravation of the tooth, you need to consult a doctor in time. Dental fillings should go to the regular medical institutions, operated by a professional physician, dental fillings should consult the doctor after detailed precautions and contraindications.