How accurate are fluorescence devices for detecting and diagnosing early tooth decay?

Dentist holding caries detector with fluorescent light for checking the teeth.

Dentists often aim to identify tooth decay that has already advanced to a level which needs a filling. If dentists were able to find tooth decay when it has only affected the outer layer of the tooth then it is possible to stop the decay from spreading any further and prevent the need for fillings. It is also important to avoid a false-positive result, when treatment may be provided when caries is absent.

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