Shock Doctor 4700 Ultra Braces Mouthguard Convertible Low Profile Design: so you can breathe and speak without interference Insta-fitTM Plus: special ortho channel fits around brace brackets and adapts to changes in tooth position as braces are adjusted providing an adaptable fit and protection from laceration. Triple-layer Protection: Flexible outer shell conforms to teeth and brace brackets. Internal core provides stability for upper and lower teeth. Low perimeter Gel-Fit below brace brackets increase retention and is remoldable. Convertible Tether: quick-release tether allows the mouthguard to be used strapped or strapless