Pop In and Play Instant fit. Instant play. OPRO's Snap-Fit Mouthguard has already been expertly shaped to comfortably rest over teeth and gums. So, there's no need for boiling or molding. Minimal effort and fantastic protection—instantly. Instant Protection Quick fit when you need it. If you've lost or misplaced your premium OPRO Mouthguard, get rapid impact protection with OPRO Snap-Fit. The durable shell offers great short-term protection to prevent sports-related dental injuries.