Here's the USA / Canada Rep site for PlaqueOff:

http://www.international-dental.com/index.html

International Dental
6781 Summerstone Court
Rancho Cucamonga, CA 91701
Phone: (909) 989-0884 Fax: (909) 989-8062
Order Line: (866) 819-9111

Email - Corporate Information: [email protected]
Email - Sales: [email protected]

They also have a "Purchase Products" page that lists their retail outlets in
the USA and Canada.

Wonder if it REALLY works?