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why does my filling keep falling out
A filling does not normally fall out. Insufficient tooth structure for the filling is the primary reason. Restorations including alloy, resin, crowns and inlays never decay, however the tooth structure under the restorations decay. In the last few decades people drink anything from Soda to coffee to Gatorade multiple times/day. In addition they snack many times/ day with new "diets". More exposures to food and drink between meals causes decalcification and ultimately decay.
It seems like everyone wants to blame the dentist for a filling falling out or the material make-up in the restoration. I have found frequently the diet and eating/drinking habits of the patient is a contributing factor. But I don't think that a dentist would put substandard materials in a restoration. Furthermore, many times over the years I have recommended crowns or onlay/inlays and the patient will select an alternative filling restoration.
If there is no decay process causing the filling falling out then the need for a crown is probable. In some circumstances the need for a root canal therapy treatment may be also indicated if there is insufficient tooth structure for the crown to be solid.
Ask your dentist if there is another restoration that would be long lasting.