We also use lasers to diagnose cavities. The Diagnodent machine uses laser fluorescence to find hidden decay in teeth at the earliest stages. Small lesions are found much sooner than if traditional instrument methods are used allowing for much less invasive fillings. Decay can also be identified so early that it can be reversed through hygiene, diet, and fluoride measures such that it may never need a filling.
Early decay as seen above on the biting surface is impossible to detect with a dental explorer. The Diagnodent finds these cavities at an early stage allowing for much less invasive treatment that preserves irreplaceable tooth structure.