it is very messy [SEP] i got this product a few days ago and have been using it twice a day since receiving it i got it as a rebate in exchange for leaving a review so to start off i am going to say that it is very messy i had to clean my sink after each use not just rinse it down the drain but actually getting the all purpose spray out and wiping it out of my sink this stuff gets everywhere it got on my shirt while i was brushing and well that stain did not come out i will not blame the product because its probably this way with all charcoal powders and i could have been more careful i was actually very delighted with the flavor in my opinion it tastes really good bonus points to them for that as far as whitening goesi am not quite sure this is even whitening my teeth i have taken before and after pictures and have not seen a difference besides the fact that it really leaves my teeth smooth i think this product is great for cleaning the teeth as for whitening though id say i have not seen a difference and i have been using twice a day for four days i will continue to use this product for probably a month because i have seen some reviews saying results take a while i will update with results