I got the Arm and Hammer Toothbrush on sale at CVS after Christmas a year ago, so I decided to be semi-green and bought interchangeable tips . when the brushes are worn. I would like to say that one head is enough for at least a month, at most two months. That's a good deal. The only thing I don't like is that part of the glans gets stuck on my tongue when I change the angle while brushing my teeth. It doesn't hurt the tongue, it doesn't leave marks or anything like that, but it can be a bit overwhelming. That doesn't stop me from continuing to buy and use them, but I think it's a downside I could do without.
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