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2. Colgate. "Colgate New and Now" Colgate. Colgate. n.d. Web. 15 February 2014
3. Colgate. "Tooth discoloration" Colgate. Colgate. n.d. Web. 14 February 2014
4. Livestrong. "Can Drinking Soda stain my teeth" Livestrong. Livestrong. n.d. Web. 14 February 2014
5. Livestrong. "Does drinking tea affect your teeth" Livestrong. Livestrong. n.d. Web. 16 February 2014
6. Contributor, Ehow. "How to Hollow an Egg." Ehow. Ehow, n.d. Web. <http%3A%2F%2Fwww.ehow.com%2Fhow_15776_hollow-egg.html>.
7. "Does Tea Stain Your Teeth?" Education.com. N.p., n.d. Web. 12 Mar. 2014. <http://www.education.com/science-fair/article/how-long-does-it-take-to-stain-teeth/>.