When the dentist doesn't use a "rubber dam", to isolate the tooth having endodontic (Root Canal Therapy). The obliteration file falls into the back of the patients throat, and the patient swallows the file!
This is the result of grinding, clenching and bruxing.YOU could be doing it while you sleep without even being aware of it. You might need to wear a mouthguard protector while you sleep so you do not destroy your teeth.
This is what can happen when a molar ‘wisdom tooth’ is left in too long. It tried to erupt up and through a perfectly good second molar tooth in front of it, which dissolved the back half of the tooth, so now both teeth had to be extracted.