Review on Food-Grade Silicone Jaw Exerciser Set for Men and Women - Jawline & Neck Exerciser, Double Chin Reducer, Facial Exerciser - Helps Reduce Stress, Cravings & Restore Youthful Face Appearance (3 Pieces) by Ashley Farrington

I started with a black ball (40 pounds) and it feels very intense against my jaw. so much. that I was taking several strokes at a time and stopping to rest in the jaw area. I recommend keep going like this and you will get the results you want to achieve, super cool gadget and best thing to do anytime anywhere :-) Thanks Revane! ++++++++++++ ++++++++++++++ Update: in about 6 hours. So I did the black ball exercise and followed the instructions carefully. I've always said I recommend it, but after the session my jaw hurts and my teeth hurt. I googled if it's safe and was advised that it's not safe as over the long term it could damage the jaw line and cause wear and tear on the jawbone. I didn't do any research beforehand and don't think I'll be using this device anymore. I will be consulting my dentist on this idea in the near future before trying any ideas online. just my new advice!