To begin with, I did use strips three or five times, but they were painful. So when I saw this at Walmart ($24), I had to try. It was a mess the first time just opening the paper under the lid and then trying to cover the brush, which is not a good idea.
Now I just lightly wet the tip of my brush and shake off almost all the water, then dip the tip of my brush into the black powder (it's difficult to get the powder on the whole brush anyway), then shake most of it back into the jar. This is enough to cover my teeth, once over. Then I brush. It does look bad while brushing and spitting out but makes my teeth feel cleaner than ever and I've had much improvement in the color after only five brushings (2/week as suggested). Of course I brush another 2 minutes with a whitening toothpaste.
Any improvement (and without pain) is great. But after this article, I will be speaking to my dentist, for safety.
Bottom Line: Yes, I would recommend this to a friend
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