Tooth decay is less than 1 year of age.

Dental caries in children before the age of 1 year and will increase rapidly in the primary teeth of children 1-3 years because the coating layer thickness is only about half of the permanent teeth. Cause tooth decay than permanent teeth have thinner enamel. The mineral calcium phosphate is less than the permanent teeth. Pulp and tooth enamel and dentin is covered with a layer of the thin. Tooth decay can spread quickly to the dental pulp. Care is good for the teeth at the age. Will result in treatment more difficult. Parents should protect and maintain the cleanliness of the teeth, since they were a year ago, especially in the tooth plaque or riding. The teeth of the upper front teeth. Tooth decay is beginning to spread to the hole decay in 6-18 months.