It's a natural anti inflammatory it's not chewed on like you would think since it's called a teething necklace, the contact with your skin warms the beads and releases the anti inflammatory into your system. Like having motrin in your system 24/7.
I got one off Amazon for my youngest and it was amazing! I never really knew when she was teething! It was by "the art of Cure" and it's got a certification with it. It was about $13