Gingival recession is the recession of the root side of the gingival margin resulting in the exposure of the tooth root. It can be localized or widespread, and is one of the common clinical symptoms in the oral cavity. In mild cases, the patient may not have any conscious symptoms, but in severe cases, it often causes root sensitivity, food impaction, and cervical caries. Due to the narrowing of the keratinized gingiva, the affected teeth are more susceptible to periodontitis. In the anterior teeth, the “black triangle” between the teeth, caused by the absence of the gingival papilla, is often aesthetically displeasing. An important cause of gingival recession is the resorption of the alveolar bone, which begins to recede when the height of the alveolar bone decreases. Alveolar bone resorption can be either inflammatory or caused by mechanical forces. The common etiologies are as follows: 1. Age: as age increases, the gums recede by 0.012 mm per year. 2, anatomical and physiological factors: 2.1 The crown shape is divided into square, oval, and cusp round, where the cusp round shape is more prone to gingival recession. 2.2 The morphology of the gingival soft tissue is thick and flat and thin scalloped, most of which are thick and flat, with thin scalloping more likely to occur. 2.3 Gingival recession with the appearance of a gingival black triangle. 2.4 The buccal side of the dentition is more sparse and weak, with a corresponding incidence of buccal gingival recession. 2.5 The gingival recession is especially pronounced when the buccal side of the alveolar bone is open and cracked due to misaligned teeth. 3, pathological factors: by periodontal disease caused by alveolar bone loss to gingival recession, is the most common cause. 4, treatment factors: periodontitis treatment or periodontal surgery is also common after the gingival recession. 5, other: bad brushing habits, the use of too hard toothbrush and coarse particles of toothpaste, excessive too high frequency of brushing, gingival recession is mostly seen in the curved area of the dental arch. Gum recession is not caused by a single factor, but more often by a combination of factors. Once gum recession occurs, it is more difficult to restore the original height through gum and alveolar bone regeneration. For minor gingival recession, no treatment is necessary if there are no clinical symptoms. For more severe or extensive gingival recession, the treatment is mainly to prevent its aggravation. For example, eliminating inflammation, adjusting the tooth fit, removing the cause of the food embedment, correcting the brushing method and appliances, etc. Meanwhile, clinical symptoms caused by root exposure often require surgical treatment to achieve root surface coverage, such as soft tissue grafting, guided periodontal tissue regeneration, etc.