If a tooth is cracked in half during pregnancy, it is recommended to extract it if it cannot be retained and try to retain it if it can be retained by root canal treatment after judging the condition of the tooth according to the degree of looseness. 1. Extraction: If the tooth is cracked in half, the location of the fracture line should be checked. If the fractured part of the tooth reaches the root apex or the looseness of the tooth in the cracked part reaches the third degree of looseness, it is recommended that the tooth be extracted as soon as possible in order to avoid inflammation and pain that may affect the fetus in the womb. 2. Retention: if the cracked tooth only reaches the root or subgingival 1-2mm, it can be crowned if there is no damage to the pulp. If the pulp is damaged, the tooth can be restored with a crown after root canal treatment under local anesthesia. Whether a cracked tooth in pregnancy needs to be extracted or not should be determined after taking a picture and doing an oral examination at the hospital.