Opro Shield Junior Silver Mouthguard - Blue / Orange. The OPRO Shield mouthguards are the worlds most advanced boil and bite self-fit mouthguards. The OPRO Junior mouthguard is designed for use by children up to the age of 9 years. The junior mouthguard is smaller and uses two different material blends which enables the mouthguard to have a tough outer shell with soft lining with self-forming orange fins for good support and comfort. Drain holes also allow rapid cooling so that the fitting is carried out at a lower temperature for greater comfort and safety when fitting. ?6400 dental warrenty. 843486001433