Review (5/5): We love them!!!! Have bought multiple times.
My husband and I switched to these from our normal plastic brushes over a year ago and we love them. It took a week or so to get used to the feel of the bamboo head, but they feel natural now. We get the medium bristles and they are still a little softer than normal plastic medium bristles, so if you like softer bristles, these will work perfect. That being said, they still do a great job at whitening and I feel like the charcoal has made a visible difference. They last just as long as a typical plastic brush so there is no buying more frequently. I highly recommend these and we have bought these multiple times so far.