American Dental Hygienists' Association, "Fluoride Facts," http://www.adha.org/oralhealth/fluoride_facts.htm (accessed February 14, 2007).

WebMD, "Dental Health: Fluoride Treatment," http://www.webmd.com/content/article/108/108850.htm (accessed February 14, 2007).

Better Health Channel, "Dental Care: Fluoride." http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Dental_care_fluoride?OpenDocument (accessed February 14, 2007).

WMDS, Inc., "Professional Teeth Whitening," http://www.animated-teeth.com/dentist_laser_whitening/a21_laser_bleaching.htm ( accessed April 3, 2007).