From New Scientist:THE dentist's dreaded drill could become a medical relic thanks to laser tests which spot weaknesses in dental enamel in time to repair the surface before more drastic intervention is needed.
Dentists currently check for cavities with X-rays and metal probes, but these cannot detect weaknesses in the enamel while there is still a chance to repair it. David Wang, a graduate student at the University of Sydney in Australia, instead studied whether the propagation of sound waves through the enamel could provide an early warning (Optics Express, vol 17, p 15592).
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