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You requested a trend report on Dentists Use A Soft, Clay Like Material To Make A Filling For A Cavity. The Filling Stays Soft Under The Light Of The Dentist’s Lamp, But It Hardens When The Dentist Shines An Ultraviolet Flashlight On It. Why Does Light From The Ultraviolet Flashlight Harden The Filling When Light From The Lamp Does Not

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