Review (3/5): None worked longer than a year
I had several Oral-B toothbrushes of different types. None of them worked longer than several months or a year. Biggest problem: water gets inside the toothbrush, and damages motor and rechargeable battery. It is very difficult to disassemble the toothbrush, clean it, and assemble it back. I had also Oral-B AA battery toothbrushes. Problems: batteries lose contact, battery lid breaks very easy.