Opro silver mouthguard opro mouthguards have stretch zones which allow fitting to all mouths wide front v for optimum adaptation and wide open front palate for optimum breathing and speech boil and bite mouthguard opro mouth guards have stretch zones which allow fitting to all mouths wide front v for optimum adaptation and wide open front palate for optimum breathing and speech patented fins break down on biting and mould to the teeth and includes posterior buffer pads for inc