Tips:The aligner chew hardness of silicone is 45°, which is a hard hardness. Usually the softer hardness is about 35° Y-Shaped Design:There are 3 different bite areas specially designed for orthodontic.To help correct bite irregularities and improve the alignment of the teeth and jaws Clean and Hygienic:Each one is individually packaged in vacuum bags, providing clean and hygienic aligner Trays Seaters Chew Highly Elastic Silicone Material:Customized highly elastic silicone to make Chew for Invisalign Aligners. Highly elastic material can extend the service life of chew Various Favors Available:We have 8 colors corresponding to different fruit flavors. Of course, if you don't like any flavor, we also have unflavored aligner chew ..