If you can find your knocked-out tooth, rinse, hold it by the crown and re-insert it into your tooth socket by gently biting down once it is in its place. If you cannot reinsert your tooth, try to keep it moist by putting it in a glass of milk or holding it in your mouth until you arrive at your office.  Call us as soon as possible. The sooner you can be treated after a tooth has been knocked out, the better the chance your dentist will have of saving it.