Severe tooth erosion in 5 year old babies can be seen in tooth decay caused by acid corrosion or poor cleaning of the teeth, which requires filling or root canal treatment depending on the condition of the pulp. 1. Filling: Severe tooth erosion may be caused by long-term diet of acidic beverages or poor oral hygiene, most of the teeth are corroded, if it has not yet reached the pulp cavity to cause pulpitis need to use resin or glass ionomer filling. At the same time, it is necessary to reduce the diet of acidic food and drinks, and do a good job of oral hygiene. 2. Root canal treatment: If the tooth corrosion caused by the defect reaches the pulp cavity, it will cause the tooth to external hot and cold stimulation pain, need to carry out root canal treatment, eliminate inflammation after resin filling. Children’s teeth corrosion is serious, it is recommended to go to the hospital in time to deal with, to avoid caries caused by tooth germ damage.