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What is a mouthguard?

What is a mouthguard? Here are some definitions.

Noun
  1. A device that fits into the mouth over one or both arches of teeth, which is usually made of plastic. They may be used to protect aginst injury during sport or fighting, or may serve a medical purpose.
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Examples
However, when you bite into the hot mouthguard to give it the right shape, you reduce the thickness of the device.
Based on the available data, the absence of a mouthguard was not a significant factor in the explanation of injury rates.
You can minimize the risk of this type of injury by using a mouthguard when you take part in sports and other recreational activities.
The boy, whose name was Tom Schaar, fiddled with his mouthguard and flashed a frustrated smile.
Talk to your dentist about having a mouthguard properly fitted to your mouth for comfort and protection.
Then I close my mouth around a molded mouthguard, setting off the release of light and heat inside.

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