If a child knocks his teeth and gums are bruised, it can be temporarily observed if it is a small area, but if there is a fluctuating sensation when touching the inside of the bruise, it is necessary to incise and drain it, and at the same time, check whether there is any damage to the teeth. 1. Temporary observation. Teeth may be impacted by external forces, tooth fracture, tooth concussion, soft tissue contusion caused by localized bruising, generally superficial bruising can be temporarily observed, and later will slowly disappear. 2. Incision and drainage. Gums if large areas of bruising, touch the fluctuating feeling, it is recommended to the hospital in a timely manner incision and drainage, can follow the doctor’s instructions to take the antibiotic amoxicillin to prevent infection. In the inspection of the gums at the same time, if the teeth are damaged also need to be adjusted grinding fixed observation, if the symptoms of pulpitis also need root canal treatment.