Don't last
I'm on the forth replacement head. And it has not been 9 months since I bought them. These work fine but after 1-2 weeks the brush head stops spinning. Can't seem to figure out what is breaking on them. After the 2nd head broke I went out and bought the Oral B brand replacement heads. Using the last of the 4 pack, then moving on to Oral B. Not worth $2 a head to last 2 weeks. I picked up eight (8) Oral B replacement heads from Costco for $30. Almost twice the price but I bet they'll last the 3 months they're supposed to last.
Rating: 1 stars