10. Four different tissues make up each tooth. The enamel is the durable, white covering. Enamel protects the tooth from the wear and tear of chewing. Dental Fact: did you know that the enamel on your teeth is the hardest substance in your body?

15. http://www.healthyteeth.org/experiments/po werFlu.html http://www.healthyteeth.org/experiments/po werFlu.html http://www.healthyteeth.org/ http://www.google.com.tr/search?q=teeth&hl =tr&prmd=imvns&tbm=isch&tbo=u&source=u niv&sa=X&ei=7- 8CT53hEKeQ4gT7trmNCA&ved=0CHYQsAQ&b iw=1014&bih=623 http://www.google.com.tr/search?q=teeth&hl =tr&prmd=imvns&tbm=isch&tbo=u&source=u niv&sa=X&ei=7- 8CT53hEKeQ4gT7trmNCA&ved=0CHYQsAQ&b iw=1014&bih=623