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That sounds very frustrating....
The repeated loss of the same filling has three likely possible explanations :
1. Inadequate restoration - It is possible that the shape created by the dentist is inadequate. A filling requires that the tooth be prepared in such a way that there is adequate "retention" for the filling.
2. It is possible that the filling material itself is inadequate to "retain" the filling. For example, sometimes composite does not have adequate "bonding" capacity or strength to stay in place.
3. Certain defects in a tooth or cavities can make it extremely difficult for the dentist to make a filling that stays in place. This can be due to a tooth with too little remaining tooth structure to hold a filling or a filling in a location such that contact from the other teeth causes it to be dislodged repeatedly. This may require a different type of restoration, such as a crown.
Perhaps your dentist can explain what the problem is in your specific case.
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