Abstract: A lip guard is provided for protecting the lips of brass and woodwind players who wear braces. Each lip guard comprises a strip of thermoplastic material that is heated, molded into place over the teeth and braces of the musician, and then allowed to cool. The lip guards thus provide a smooth, protective barrier between the musician's lips and braces that protects the lips against chaffing that might occur as the mouthpiece of a musical instrument presses back against the musician's lips. The lip guards can be removed from the teeth quickly and easily between performances and can be reused from performance to performance. If adjustments are made to the musician's braces, the lip guards can be easily and conveniently reheated and remolded to accomodate the new shape.