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Depends on the risk category of the patient. Every year for a low risk patient is good, high risk anywhere from 3 to 6 months. Unless something specific is going on, tooth hurts, before any definitive tx like a crown, it's good to verify that nothing is going on underneath the root, that type of thing. The radiation exposure from a set of bite wings is extremely low, .005 millisieverts, which equals an a average day of background radiation.
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