Opro self fit gen 3 silver mouthguard redblue product details designed by dr anthony lovatbdsthe founder of opro the worlds largest supplier of custom mouthguards all oproshield models introduce the patented oprofin retention system which gives the oproshield the best retention fit performance of any self fit mouthguard in the world the highly technological cross sectional profile present in all the range means maximum protection against front and concussive blows whilst