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DENTAL LASER: DOES IT HURT? NO, WHY?

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shahina:
  TREATING CAVITIES WITH LASER: DOES IT HURT? NO

Each burst of laser light from a dental laser lasts only thirty-trillionths of a second, much faster than the amount of time a nerve takes to trigger pain. In other words, the beam would have to last 100 million times longer in order to cause any discomfort. So this sort of treatment requires no anesthetic.

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