A small piece of incisor knocked is a very common clinical situation, knocked a small piece is certainly no pulp leakage, only consider this small piece of restoration can be, generally for this small piece of restoration can use two restoration methods. One is to use dental filling material resin to restore it directly, and the other is to do porcelain crown to protect it, these two methods have their advantages and disadvantages. If the dental resin is used to fill the tooth, it can achieve a better aesthetic effect accordingly, but it must be noted that this part can not withstand large joint forces, that is, when biting hard objects must be avoided, if the melon seeds must also be avoided. Because once this part is stressed the corresponding filling material may fall off, but if the crown restoration is applied it will cause more damage to the tooth.