Called Diagnodent, the $2,800 machine illuminates the tooth with a low-power red laser and measures whether the enamel glows, or luminesces, in response -- a sign of bacterial degradation.

• 这种机器被称作diagnodent，价值%242,800，它可以用低功率的红外线照射牙齿，并且测出牙齿的珐琅质是否发热或发亮，这是细菌性降解的相应反应。