I loved the idea of this teether. Unfortunately, I am not sure if I should us it. I just got my order from UPS. I sterilized the Raz according to the instructions on the package. I put it in boiling water for 5 minutes. Cooled and inspected. The glue or adhesive that holds the ring part to the raz part melted away and the ring part is breaking off. Very upset. I would have sanitized in the dishwasher, but I was in a hurry to give to my baby. A flimsy product.