By using a Save-A-Tooth^® Emergency Tooth Preserving System, knocked-out teeth can almost always be successfully replanted and retained. Time is the critical factor. A knocked-out tooth placed quickly into the Save-A-Tooth system has the best chance of being saved. Save-A-Tooth^® is the only low cost scientifically tested emergency first aid device that can protect and preserve knocked-out teeth for 24 hours.