Having a period (clinically known as menstruation) is possible to fill a tooth, and there is no necessary connection between the two. 1. Dental filling is a routine treatment in dentistry, which is mainly used for dental caries, wedge-shaped defects or dental trauma caused by tooth loss and other symptoms; the process of dental filling is that the doctor first cleaned and prepared the missing parts of the teeth, and then used oral restorative materials to repair the missing parts. 2. Menstruation is a normal physiological change in women, which has no effect on dental fillings, so the menstrual period can be filled; however, the blood coagulation ability and immunity during menstruation will have a certain decline, so menstruation is not advisable to carry out surgical traumatic surgery, such as extractions, in order to prevent postoperative bleeding or symptoms of infection.