Review (5/5): Save yourself some clean up and use it in the shower
This is a very fine powder, so you have to clean your sink afterwards-so using it in the shower is a good solution. i suggest purchasing a dedicated toothbrush for this as the brush head will be holding onto a lot of the powder. The taste is better than I thought is would be. With a lot of swishing it comes out from between the teeth. too vigorous of brushing will irritate your gums. I do notice a difference in teeth brightness after use. So I will buy again.