Brush lightly!!!!
BEWARE! BRUSH LIGHTLY. I was a little over zealous the first time using this product and I really gave my gums a terrible road rash. I LOOOOOVE how clean this makes my teeth feel. As far as the whitening effect of this powder, I would give it a 3 out of 5. My teeth appeared brighter, but I wouldn't say it gives a long-lasting whitening effect. Also- I find that the charcoal ends up under my gums after brushing with this, but it does disappear after some time.
Rating: 4 stars