There is no single lifespan for every filling.
The longevity of a filling depends on factors including:
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Size of the restoration
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Location of the tooth
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Filling material
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Oral hygiene
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Diet
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Bite forces
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Grinding or clenching
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Recurrent tooth decay
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Regular preventive dental care
Fillings should be monitored during routine dental examinations so your dentist can identify signs of wear, leakage, fracture, or recurrent decay.