The term tetracycline refers to a broad-spectrum antibiotic, and many inflammatory diseases caused by bacteria are treated well with tetracyclines. Therefore, in the 1960s and 1970s, tetracyclines were widely used as the anti-inflammatory drug of choice. Many children at that time had taken tetracycline drugs, resulting in the absorption of such drugs by the growing teeth, and the metabolites left on the teeth were deposited in the dentin tubules, making the teeth gray, yellow or brown, thus forming tetracycline teeth. The formation of tetracycline teeth: During the development of teeth (childhood), the tetracycline drugs taken are deposited in the dentin and enamel causing tooth discoloration and enamel underdevelopment, resulting in changes in tooth color to varying degrees of yellow, tan, dark gray and other lesions. Performance of tetracycline teeth: 1. Different degrees of yellow, brown or dark gray. 2.Most of the front teeth are colored more obviously than the back teeth, combined with enamel hypoplasia, which is an irreversible disease damage. 3, Some patients with tetracycline teeth have psychological burden and harm. Tetracycline teeth traditional treatment methods: 1, bleaching method: simple bleaching treatment, milder people better, just easy to rebound, color reproduction. 2, porcelain teeth: some severe tetracycline teeth can choose porcelain dental restoration; but many cases were over-treated, resulting in permanent irreversible damage to the teeth. The latest non-invasive or minimally invasive restoration of tetracycline teeth: 1, according to the patient’s requirements, tetracycline tooth coloring depth, location, neighboring teeth shade, tooth size, enamel hardness comprehensive selection, under the premise of minimally invasive or non-invasive, choose a personalized treatment method to shape the coordinated perfect color and shape. 2.Tooth whitening + nano-resin veneer treatment: it can decolorize the colored area and whiten the non-colored area, and the flexible use of shading and veneer can produce a coordinated effect. 3, the biggest advantage is repeatable, short treatment time, directly completed by the treating doctor to retain the opportunity for subsequent restoration, without causing irreversible damage. 4, porcelain veneer method restoration: remove the lip side of the tooth tissue, slightly damage the tooth, although currently in the clinical application of many, but not advocated as the first choice.