1. Centers for Disease Control and Prevention 2011 www.cdc.gov/chronicdisease/resources/publications/aag/osh.htm
2. Tobacco cessation, the dental profession, and the role of dental education;Christen;J Dent Educ,2001
3. American Dental Association www.ada.org/2056.aspx
4. Academy of General Dentistry: Can tobacco products harm my mouth? 2008 www.agd.org/public/oral-health/Default.asp?IssID=335&Topic=T&ArtID=3815#body