it doesn't need to
www.newscientist.com/lastword/article.jsp?id=lw108
it is caused by the detergent in toothpaste which makes the foam, making us think it is cleaning.
it is not useful in the cleaning whatsoever.
(the top answer in the NS article is wrong)
( ,
Mon 27 Oct 2003, 22:52,
archived)
it is caused by the detergent in toothpaste which makes the foam, making us think it is cleaning.
it is not useful in the cleaning whatsoever.
(the top answer in the NS article is wrong)