If a tooth gets knocked out of position or completely knocked out of one's mouth:Do not scrub, disinfect, or allow the root of a dislodged tooth to dry out.Rinse the tooth with saline or water to remove debris; do not touch the root.Re-implant the tooth right away, if possible. Push the tooth into the socket; hold it in place with your fingers or by gently biting down. If unable to reposition the tooth, store it in milk or your saliva (possibly in cheek). See a dentist as soon as possible (ideally within 30 minutes). The longer the tooth is out, the less chance for successful re-implantation.
Source: Auerbach’s Wilderness Medicine, 7th Edition