There is no substitute. The Oxygen is the original patented mouthguard designed and developed by athletic, dental and medical experts to deliver superior airflow and better performance. This "Slime" football mouthpiece delivers more oxygen to the muscles for faster recovery, clearer thinking and faster reaction times play after play. Available with convertible strap.With the no boiling and maximum protection features, this is the best mouthguard for braces. For players that have braces, you will be able to ditch the boring braces mouthguard and choose from a variety of styles and colors like everyone else. FEATURES: No boiling required Works with braces Helps open TMJ Maximum breath-ability Advanced composite Absorber shield Comes with attachable strap One Size Fits Most Patented design leverages SCUBA breathing innovations Largest breathing hole on the market Unlimited Defective Guarantee 5K Dental Warranty with or without braces