Use aperture priority about f11 or even f16 at a low ISO, say 100. The flash, assuming it is TTL should sort out the exposure automatically. Your dental light will give good light for focussing. For pictures of the biting surface of back teeth use an angled mirror (not the small dental one) and shoot the reflection. I believe a mirrored piece of metal is often used or a normal little mirror. Front teeth should be very straight forward with the lips held back with retractors. Hope that helps.
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