If a 1.5 year old baby’s incisor is partially broken, no special treatment is needed in general, but if the situation is serious, root canal treatment and tooth extraction can be carried out under the advice of a doctor. 1. No special treatment is needed: 1.5 year old baby’s incisor is partially broken, you can go to the hospital to take a picture, if the root of the tooth is intact, you can first observe, no discomfort, then use resin to fill the tooth, and then the baby will be able to replace his/her permanent teeth after he/she is 6 years old. 2. Root canal treatment: 1.5 year old baby incisors knocked off part, if the pain and other discomforts. Root canal treatment can be carried out under the advice of the doctor. 3. Extraction of the tooth: If a part of the baby’s incisor is broken in a more serious case, the tooth can be extracted under the doctor’s advice in order to avoid affecting the normal development of other teeth. If a 1.5 year old baby’s incisor is partially knocked out, it is necessary to go to a professional hospital in time to improve the examination and choose the appropriate treatment under the doctor’s advice.