Gingivitis is the inflammation of the gums. The cause is the long-term formation of plaque, a thin layer of soft, sticky and colorless bacteria on the teeth and gums. When we have this disease, we should go to the hospital for a routine examination to avoid more serious oral diseases. The routine examination items of gingivitis are as follows: 1. The examination shows that there is tartar attached to the neck of the teeth and the color of the gums changes from light red to dark red. The gums are loose and can be mildly swollen, and spots are formed on the teeth and gums. 2, oral endoscopy: a specially constructed camera lens that can reach into the mouth and display clear and magnified images on a computer or TV screen. With the assistance of the endoscopic system, the dentist can better detect the lesions occurring on the soft and hard tissues. And can allow patients to intuitively and comprehensively understand their oral dental surface stains, plaque, calculus and gingivitis and other dental diseases and dental defects that they normally cannot see. 3, oral CT examination: three-dimensional angle to reflect the tissue situation, can find the oral X-ray projection angle can not be found, or more subtle lesions; its three-dimensional reconstruction effect can be accurate evaluation of the bone tissue situation, jaw joint situation, to assist doctors in pre-surgical program design.