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There are many reasons why a bridge can keep falling out :
- the teeth have not been prepared correctly to receive the bridge, hence the native retentiveness of the bridge is low
- the impressions of the teeth haven't been made very accurately
- the bridge is not made very well by the dental lab
- the bridge has not been cemented properly by the dentist
It's difficult to say exactly what is causing the bridge to come out again and again. Also, eating sticky food can cause a bridge that is well done to come out.
Please discuss all these possibilities with your dentist.
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Good Luck !