The present invention provides an improved mouth guard (10) for braces having a U-shaped base portion (30) made from EVA or similar plastic having a melting point less than the boiling point of water, and an upper portion (20) extending generally upwardly from the outer perimeter of the base potion with an inner surface (21) made from PVC or similar material having a melting point greater than the boiling point of water, whereby a partially custom-fitted mouth guard is provided for users with braces.