Shock Doctor Nano Double Mouthguard Review The Mouthguard Review participates in the Amazon affiliate partnership program. Please support this website by clicking the Buy Now link to purchase a product recommended below. There is no extra cost to you. If you have purchased from the site in the past, thank you! I really appreciate your support! Shock Doctor Nano Double: Price: $11.41 Buy Now amazon.com Manufacturer Product Info: Nano protection for uppe