Recently, Mrs. Lee was particularly disturbed because her toothache made her sleep badly at night. She wanted to have her tooth extracted, but was worried about infection. Because she had knee replacement surgery only a year ago, the doctor told her to be careful about pulling out the tooth. So, is the tooth extracted or not? Will the tooth be infected if it is extracted? As a matter of fact, many patients after knee replacement surgery have the same annoyance as Mrs. Lee. In fact, the risk of joint infection due to most oral diseases is not as high as we think. Only a small number of problems, such as tooth extraction and pulpitis, can cause bacteria in the mouth to “travel” to the joint through the bloodstream, leading to infection of the artificial joint. As for the question of whether or not teeth can be extracted after knee replacement, the patient needs to consult with the attending surgeon beforehand, and the most suitable plan for the patient will be formulated through communication. In fact, in addition to tooth extraction, as long as there is a traumatic operation after surgery, no matter which part of the body is to be treated, and the treatment has the risk of infection, you need to consult with the attending surgeon at the first time, through the doctor’s guidance to prevent infection.