Dental implants that is dental implant surgery, preoperative examination generally includes general condition examination, oral general examination, imaging examination, etc., as follows. 1. Systemic examination: generally includes routine blood test, bleeding and clotting time, blood sugar, cardiovascular system, liver function, kidney function, and infectious disease screening. 2. General oral examination: including the gap between the missing teeth, the shape of the jaw arch, the health of the neighboring teeth and maxillary teeth, the occlusal relationship, the thickness of the soft tissues in the operation area, the width of the attached gingiva, and oral hygiene. 3. Imaging examination: including the bone volume of the jaw, bone density, the maxillary sinus with or without inflammation, the position of the sinus floor, the position of the chin foramen and the mandibular canal, and so on. It is recommended to go to the hospital to receive regular treatment.