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JAWLINE EXERCISER JAW FACE & NECK EXERCISER Products DescriptionSpecificationJawLine Muscle Training Fitness BallBrand NameAncestorModel Numberancestor111GenderUnisexColorBlue/Purple/Black/Grey/PinkMaterialFood-grade Silica GelUsageJawLine Muscle TrainingPackingPP bagWeight25ghot sale face and neck exerciserhow to use: 1.to fit,first practice placing product and get the feel for how wide you should open your mouth2.Put product with biting strips in boiling water for 20-24 seconds3.Remove Jawline exerciser from boiling water, shake off excess water,but don't wait too long to let it cool4.Stick your thumbs through the hole,place and adjust jaw exerciser ball so you are biting down on bite strips