When silver fillings are placed they continue to harden for the next twenty four hours. Dentists often ask patients to refrain for eating for 45 minutes in order to allow time for the filling to be hard enough to withstand the pressures involved with eating.
Even patients who have had composite filling placed would be wise to not eat for a short time afterwards so that their numbness can wear off. This is especially true for lower fillings, since the mandibular block anesthesia often used numbs both the tongue and lips. Patients who eat before sensation returns risk accidentally chewing on their tongue or lip.
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