Fillings are materials used to fill cavities in the teeth. When a tooth becomes very decayed, and especially for the posterior teeth, crowns will be recommended.
Crowns cover the tops of damaged teeth, to provide extra stability to the tooth.
Sometimes, fillings or crowns fall out. In some cases, a filling or crown may come loose because there is decay underneath it.
The decay destroys part of the tooth, so it no longer has a tight hold on the crown or filling.
Most of the detached crowns are the temporary crowns, the type where the dentist would fix for you in between visits.
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Fuente: Youtube / Tamisha Denis