Not sure which one is the 'best' but I used Colgate with advanced whitening formula. It worked, if its really 5 micron I have no idea, but its finer than 9 micron for sure! James ----- Original Message ----- From: "Richard Schwartz" <richas@earthlink.net> To: <atm@shore.net> Sent: Wednesday, March 21, 2001 9:30 PM Subject: ATM - Toothpaste > > What U.S. toothpaste brand is best? > > >