American Dental Association, "ADA Seal of Acceptance: Toothbrushes," http://www.ada.org/ada/seal/toothbrushes.asp (accessed March 17, 2010)

American Dental Association, "Oral Health Topics A-Z: Cleaning Your Teeth and Gums (Oral Hygiene)," http://www.ada.org/public/topics/cleaning_faq.asp (accessed March 17, 2010)

American Dental Hygienists Association, "Proper Brushing," http://www.adha.org/oralhealth/brushing.htm (accessed March 17, 2010)

Colgate Professional, "History of Toothbrushes and Toothpastes," http://www.colgateprofessional.com/patienteducation/History-Of-Toothbrushes-And-Toothpastes/article (accessed March 17, 2010)

Columbia University College of Dental Medicine, "Brushing Your Teeth," http://www.simplestepsdental.com/SS/ihtSS/r.WSIHW000/st.31845/t.452802/pr.3.html (accessed March 17, 2010)

Consumer Reports, "Important Toothpaste Features - What to Look For," http://www.consumersearch.com/toothpaste/important-features (accessed March 18, 2010)

MSN Health, "Safeguard Your Smile: How to Nix Four Common Oral-Health Complaints," http://health.msn.com/health-topics/oral-care/articlepage.aspx?cp-documentid=100245745 (accessed March 18, 2010)