Colgate World of Care, "Fractured and Broken Teeth," http://www.colgate.com/app/Colgate/US/OC/Information/OralHealthBasics/EmergenciesInjuries/DentalEmergencies/FracturedandBrokenTeeth.cvsp (accessed January 20, 2010)

Medline, "Cracked and broken teeth--definitions, differential diagnosis and treatment," http://www.medscape.com/medline/abstract/17696060 (accessed January 20, 2010)

WebMD, "Do you have a cracked tooth?," http://www.webmd.com/oral-health/cracked-tooth (accessed January 20, 2010)