General metal bracket orthodontic appliance: This kind of dental appliance fixes brackets and teeth together, and sets wire arch in the groove of brackets to control the height and direction of teeth and the connection between wire arch and brackets. The dental appliance locks the square card by putting the wire bow into the groove, which is convenient and favorable without binding. You don't have to open your mouth for two hours, so it's convenient to change the silk bow in the future. But metals are easily oxidized and discolored.

Ceramic braces: ceramic braces have high strength and hardness close to enamel. Strong dye resistance, not easy to change color, and greatly improved crushing resistance.

Compared with metal ceramic braces, ceramic braces have their own advantages. The inner crown edge of porcelain-fused-to-metal braces is in contact with the heel of teeth, and its biocompatibility is not as ideal as that of ceramic materials, and the ceramic edge is better and the aesthetic effect is better. It is an important development in the field of tooth beauty in recent years.