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How to fix a lost dental crown
Get the crown out of your mouth.
Carefully retrieve the crown from your mouth so that you do not drop it or swallow it. If you have already swallowed it, you are not in danger, but the crown will need to be replaced.
If you have lost the crown, you can coat the tooth surface with an over-the-counter dental cement (available at many pharmacies) to temporarily seal the area until a dentist can repair it. Call a dentist as soon as possible.