Teat: anatomical natural rubber teat 100% free of BPA, PVC and phthalates Made in Denmark. Complies with strict EN1400 regulations. The manufacturer recommends changing the pacifier every 6 weeks. We never recommend microwave sterilization. And in this case, as it is a PP pacifier and the assembly is made with the same rubber as the teat, uncontrolled high temperatures can cause the pacifier to be dismantled. We recommend that you heat a pan with boiling water, remove from the stove and place the pacifiers in for 2 to 5 minutes.