Every second counts when trying to save a knocked-out tooth, to get to your dentist or a hospital as soon as possible. Typically, there is only a 30-minute window of opportunity to re-implant the tooth in the socked. If possible, transport the tooth in cold milk but if that is not available, use saliva, saline, or as a last resort, water. Do not wrap the tooth in anything or let it dry out. Try to avoid touching the root of the tooth.