In some cases, a tooth can be reinserted into the mouth. However, this isn’t always th case. When a tooth is knocked out, a patient needs to get to the dentist within in an hour for the tooth to be put back in. In the meantime, the patient should try and keep the tooth in their mouth either against their cheek or in the socket. If this is not possible due to the injury. It is recommended that the tooth is placed in saline or milk. Some first aid kits have tooth saving kits, that include saline designed to protect a tooth while in transit.