My 4 yr olds teeth are so crowded because of her lip and tongue ties. Her crowded teeth and mouth breathing are causing cavities. Her teeth were so crowded that her front two teeth were starting to form a V. She's been using the myo nozzle daily for about 6 weeks and she has SO much more energy, sleeps with her mouth closed and her teeth actually have room to grow. I wouldn't believe it if I didn't see it myself. Truly a game changer.