For fixed dentures with missing teeth, it is necessary to grind down both sides of the teeth to make crowns to restore the missing teeth, which is a bridge. This means that the missing teeth need to be supported by two teeth on both sides, that is, to install three porcelain teeth, the two teeth on the side need to be polished. Bypass dentures are porcelain-fixed and movable. The activity is cheap, but it takes about a month to get used to it, and it needs to be removed every night for brushing and soaking in water; the fixed bridge porcelain teeth need to destroy both sides or one side of the real teeth, and the real teeth may be ground Small, it may be sensitive even if desensitized.