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Under Armour Performance Mouthwear Bite Tech Using patented technology, UA Performance Mouthwear increases strength and endurance and reduces stress. Research has shown that when training or competing in sports, the natural instinct for most people is to clench their jaw, compressing the temporomandibular joint. This in turn triggers the release of excess amounts of hormones like cortisol, which can lead to stress, fatigue, and distraction.1 The same holds true for high-stress occupations like fire fighting.