I is well-known that dental enamel and dentine luminesce when exited by light in the ultraviolet and short-wave visible range and that this luminescence is different in intact and carious tooth substance. This effect has been proposed as a means for detection early enamel caries but the methods applied have generally involved extensive protective measures against ultraviolet radiation and complicated detection systems.
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Bjelkhagen et al. (1981) studied this question.