There is no substitute. The Oxygen is the original patented mouthpiece designed and developed by athletic, dental and medical experts to deliver superior airflow and better performance. No boiling required, boiling is a thing of the past - this is the new standard in comfort, protection, and performance. The Oxygen "Nightmare 2.0" Mouthguard is available with a 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. PERFORMANCE TECHNOLOGIES: Patented design leverages SCUBA breathing innovations Largest breathing hole on the market Helps open TMJ Maximum breath-ability Advanced composite Absorber shield ADDITIONAL SPECS: No boiling required Works with braces Comes with attachable strap One Size Fits Most Unlimited Defective Guarantee 5K Dental Warranty with or without braces