A knocked-out tooth begins to die after 15 minutes and after two hours the probability of saving the tooth is very low. The Save-A-Tooth system protects, nourishes and revives the tooth for up to 24 hours until a dentist can replant the tooth. When you use the Save-A-Tooth system, a knocked-out tooth can be successfully replanted and retained in up to 90% of cases. Time is critical - the sooner the knocked out tooth is placed into the system, the greater are the chances that the tooth can be saved. The Save-A-Tooth system can help you avoid costly bridgework and preserve your natural smile.