When a permanent tooth gets knocked out it is referred to as an avulsed tooth. Avulsed teeth can often be successfully re-implanted into the jaw. However, there are a few things you need to do. First, the tooth can be rinsed under running water, but not scrubbed. Teeth have fibers on them that connect the teeth to the jawbone. Re-implantation success is greatest when these fibers remain intact. Second, get to your dentist or the emergency room between 30 minutes to two hours after the tooth is knocked out. Finally, transport the tooth in either milk, a saline solution, or in saliva from your mouth. All these transport medias will keep the tooth at the correct pH and greatly improve the chances of saving the tooth.