Great product at affordable price
First of all, I appreciate this is a natural and cruelty-free product.  I started using it after I finished my Hello charcoal toothpaste.  It took me a few days to get used to the "charcoal" taste, but it is not strong.  I floss first, use this product with regular toothbrush, then brush teeth with my regular toothpaste and electronic brush.  While I didn't see significant whitening immediately, it kept the whiteness I have.  But I am a daily coffee/black tea drinker as well as occasional red wine drinker.  It does color bathroom sink, but it won't stain.  Overall, I like the product and continue to use!
Rating: 4 stars