I bought this toothbrush in January and also one for my daughter. By early summer we both noticed a strange metallic taste and the toothpaste in our mouths was gray instead of white. Black drops started coming out of the handle and it became clear that metal from inside the handle was mixing with the toothpaste and getting into our mouths. Other than this problem I thought the device was great but this is just not acceptable so I am buying a different brand.