The labial metal bracket is the most commonly used in clinic, which can be divided into domestic and imported brackets. Relatively speaking, imported brackets have the advantages of low friction, strong adhesion, fine surface treatment and little irritation to oral mucosa. For patients with high aesthetic requirements, ceramic brackets, invisible appliances or lingual appliances can be selected. Ceramic brackets stuck to the lips of teeth are difficult to detect because of their similar texture to teeth, but ligating wires and main arch wires can still be seen. The invisible appliance is transparent and beautiful, but it is only suitable for simple cases. Lingual appliance has the least influence on aesthetics, but it is complicated to operate, which makes patients feel uncomfortable, expensive and seldom used in clinic. Self-ligating bracket is a kind of high-efficiency appliance with low friction, fast tooth movement and long interval between follow-up visits, but it has not been made in China at present.