If a piece of tooth is knocked out, you can choose to adjust the bite, filling, root canal treatment and so on. 1. Adjustment of occlusion: When a tooth is knocked out and the loss of tooth tissue is relatively small and shallow, limited to the enamel only, it is necessary to adjust the occlusion and remove the thin-walled weak tip. 2. Filling: If a tooth is knocked out and the loss of tooth tissue reaches the dentin, it is better to fill the tooth with composite resin after acid etching in order to restore the shape and chewing function of the tooth. Don’t eat anything too hard after filling to prevent the filling material from falling off. 3. Root canal treatment: If a tooth is knocked out and the nerve is exposed, it is necessary to fill the root canal of the tooth, and if there is no pain after two weeks, the tooth will be restored with a crown to prevent the tooth from splitting. If a tooth is knocked out, go to the hospital in time to be examined by a doctor to determine the best treatment method.