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The fun of diving can easily be ruined by an ill-fitting regulator mouthpiece. JAX mouthpiece was developed by a dentist to prevent discomfort and headaches associated with bulky mouthpieces. Standard rubber mouthpieces can cause extreme jaw muscle fatigue with prolonged use because they have no stability, and they can alter the jaw position. The JAX mouthpiece is customizable to your personal teeth and jaw bite, resulting in unbeatable comfort while diving.