Improperly fitted mouthguards can lead to ulcers in the soft tissues and fail to adequately protect the wearer. To ensure maximum safety, there are four main types of mouthguards available:

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In international cricket, a third umpire is employed in uncertain situations to provide guidance to on-field umpires.

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Various types of LED displays, such as remote control scrolling signs, message signs, indoor and outdoor moving messages, are used by people to obtain information.

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