Features:_x000D_ _x000D_ Bottom concave and convex design_x000D_ Effectively prevent slippage caused by external impact_x000D_ _x000D_ Thickened base design_x000D_ More fit to the mouth, bite-resistant and wear-resistant, comfortable to wear_x000D_ _x000D_ Grooved breathable design_x000D_ breathe freely,Free and comfortable_x000D_ _x000D_ Warm bite design_x000D_ Can be shaped multiple times and used repeatedly_x000D_ _x000D_ EVA material_x000D_ Medical material, environmentally friendly and non-toxic_x000D_ _x000D_ Suitable for a variety of scenarios_x000D_ boxing, Sanda, football, basketball, football, Taekwondo, puck, hockey _x000D_ _x000D_ Package includes: 1 * Sport Mouthguard _x000D_ _x000D_ How to use_x000D_ 1, Prepare boiling water of 60-70 degrees_x000D_ 2, Put the mouthguard in 60-70 degree boiling water for about 30 seconds_x000D_ 3, Take it out and put it in your mouth, bite it for 5 seconds_x000D_ 4, Put in cold water for 10 seconds,Shape your mouthguard_x000D_ 5, If it still does not fit your teeth, then you can repeat steps 1-4 to make the mouthguard better shape and fit your teeth