In case of tooth pain in the middle of pregnancy, treatment can be carried out separately according to the specific situation. As the condition of fetus and mother is more stable in 4-6 months of pregnancy, the corresponding treatment of caries and pulp can be performed. If the patient has deep cavities in the crown and sensitivity to hot, cold, sour and sweet, it is possible to remove the decayed tooth tissue and then use clove oil zinc oxide for pacification treatment, remove part of the temporary seal after the symptoms are relieved, double bedding and then use glass ionomer cementum or composite resin for filling. When the cavity is close to the pulp angle, use calcium hydroxide pulp protector bedding to protect the pulp and then finish the filling. If the pulp angle is exposed and acute pulpitis occurs, the pulp can be removed under local anesthesia and the root canal disinfected to complete the root canal treatment.