Braces generally rely on the following methods to stay fixed to the teeth:1. Friction. There is friction between the braces and the dentition, generally between the material and the dentition will produce a certain amount of reverse force, which will keep the braces fixed on the teeth.2, retention force. The teeth generally need to be prepared to grind small, and need to make the edge of the teeth shoulder table, in this case, the fixed shape and the braces will have a fixed force between the braces, can keep the braces more stable. 3, adhesive force. Braces on the dentition, generally need to be placed on the adhesive, some adhesive will produce adhesive effect, some will produce chemical effect, usually will be fixed in the dentition, and will be relatively close, after bonding, remove excess adhesive, braces will be completely fixed on the teeth.