I didn't notice the teeth getting whiter, but I like the feel of the bristles. They are soft, but not as soft as commercial brushes. I had some gum irritation and the brush doesn't feel too rough. The handle is smooth and hard as stone. I'm not sure if this will really break down in a few decades but they say it's biodegradable so let's hope so. The bristles are initially black, but quickly turn light gray after use. At $12 for 6 brushes this is good value. I really like that each brush comes in its own thin cardboard case so you can just toss it in your bag on the weekends. I would recommend and buy again.
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