I actually make custom mouthguards for different sports. If the lower teeth get smashed into the upper teeth it can cause concussion. We also change the design and materials depending on the sport, so for boxing/mma we use 3 soft layers with extra protection around the anterior teeth. For stick sports that use sticks, hard balls or metal studs on boots we use 2 soft layers and 1 hard layer over the labial section canine to canine. This helps to stop teeth being knocked out. For other lower contact sports 2 soft layers is generally enough. We also should include a radiopaque insert as apparently at least a couple of mouthguards get swallowed every year and without the insert it’s very difficult to find them on an x-ray.
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