Jaw Exerciser, Bite Block for Regular Bite, Intermediate Jawline Shaper, Facial Exercise Cubes for Toned Face, Jawline Sculptor for Slim Jaw, Mouth Exerciser for Jawline, Craving & Stress Reducers

I'm shocked to find out that this product is not tested or approved by the FDA. I regret not reading more reviews before buying it. Do not put something in your mouth and chew it before you know what it contains. If your teeth pierce whatever material the product is made of, there is a risk of micro-plastics and other toxic substance leaking into your mouth.The product feels cheap and it's only made of one layer of silicone with some holes to make it more squishy.I regret not buying Jawliner - So far it is the only product I know which has 3 layers with 2 types of silicon. Middle Layer – made of highly-dense silicon - provides the resistance when you bite down; and the Top and Bottom Layers – made of flexible silicon to prevent it from breaking when you chew on it, and probably makes it last longer. AND it's the only one I've found that have been tested and approved by the FDA