One year old baby caries, can take a variety of treatment measures, as follows: First, adjust the diet structure: try to eat less too sticky, too sweet food, to avoid caries-causing bacteria decomposition of carbohydrates and produce acid to destroy the tooth tissue. Correct bad habits: correct the bad habit of holding milk bottle before bedtime to prevent the food residue from sticking to the tooth surface. Three, timely cleaning of oral mucosa and tooth surface: reduce the retention of plaque. Smooth car needle sharpening edge: When superficial defects are produced in milk teeth, smooth car needle sharpening edge can be applied and fluoride containing drugs can be applied to promote enamel remineralization and prevent the expansion of defects. 5.Scrape away the large piece of decay: When a deeper cavity is formed in the baby tooth, the large piece of decay can be scraped away and repaired by using glass ion cement. Pre-formed crown restoration: Resin or metal pre-formed crown restoration can be made when a large area of caries occurs in milk teeth.