Baby’s tooth decay is not calcium deficiency, it is related to the following points: 1.Baby’s food is too fine and contains high sugar, which is easy to produce acidic metabolic substances under the action of a large number of cariogenic bacteria in the mouth, corroding the tooth tissue and forming cavities. 2.Baby’s oral hygiene cleaning is not timely, food residues and soft scale adhere to the tooth surface, which can make the tooth demineralized and gradually develop into cavities after a long time. 3.With baby’s With the rapid growth and development of baby, the gap between baby teeth will be bigger and bigger after the jaw bone is elongated, and it is easy to embed the food residue and soft scale, which will cause the caries on the adjacent surface of teeth. 4.The chewing muscle group and tongue movement of baby are not perfect yet, and the cleaning effect on the tooth surface is poor, which is also an important factor to promote the occurrence of dental caries.