Is tooth that has been knocked out.
A tooth that has been completely dislodged from its socket by excessive pressure or accidental trauma. Sometimes called traumatic avulsion, a tooth that has been knocked out requires immediate treatment by a dentist. If the person is bleeding, a clean piece of gauze or tissue should be folded into a pad and placed over the tooth wound. The tooth should be placed in a cup of milk to be taken to the dentist. If milk is unavailable, the tooth may be placed in cool water or saline (salt) solution or wrapped in clean wet cloth or gauze. It should not be placed in tap water because the minerals in the water can harm the tooth.