Instructions: 1.Boil to Fit, When you boil the product, you are supposed to put the whole product in the boiling water. Have it there for 15-25 seconds. Then rinse the product from the hot water. 2. Adjust to TeethAfter you've boiled the product for 10-15 seconds and rinsed the hot access water, place the product on your teeth and gently press down on the white bite strips to mold them for the most comfortable fit . 3.ExerciseThen you are good to go! Please follow our Recommended Workout Scheme to get the best results and reduce the risk of injury. 4.Measure Results Before you start we suggest that you take a picture of yourself with clear lightning. Then after 4-8 weeks+ of frequently exercising Jawline take a new picture and see if you've made some progress. Specification: Material: Silicone Size: One size Color: purple, blue, black Package includes: 3*Jawline Exerciser Ball