Two-year-old baby incisor caries, can probe the depth of cavity, conduct pulp vitality test, and take X-ray film and treat separately, as follows: 1.Grind away the caries: If shallow caries is formed on the incisor near-middle or far-middle adjacent surface, you can apply smooth turning needle to grind away the caries and then trim the shape high point to facilitate food overflow. 2.Remineralize the enamel: If extensive shallow caries is produced on the labial or lingual surface of incisor, you can rub to remove If the X-rays show that the cavity of incisor is deep and close to the pulpal angle, the discolored tooth tissue can be removed slowly by using low-speed ball drill, and filled with composite resin after placing calcium hydroxide cushion. 4.Removal of pulp: If the incisor has pulpitis or periapical inflammation, the pulp can be removed directly and the root canal can be removed. The pulp is removed directly, and the canal cavity is closed with iodoform paste after root canal disinfection, and a resin preformed crown is made for restoration.