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  1. Soda and the Effects on Our Teeth By Benjamin Kearney

  2. Big Question • How do different colas break down the enamel on our teeth? • Which Cola is the most corrosive to our teeth?

  3. Explanation of Big Question • The sugars, carbonation, and acid break down the enamel on your teeth.

  4. Hypothesis and Explanation • If an egg shell is put in cola, then the egg shell will become discolored and thin. It will be broken down because of the sugars, carbonation, and acid. The cola will have a similar effect on human teeth as it does on the egg shells.

  5. My Interesting Facts • Soda discolors our teeth. • Soda wears away the enamel on your teeth and makes them weak. • The Coca Cola left a film in the jar. • Phosphoric acid is also found in milk, meats, and grains. • Phosphoric acid has very little effect on our teeth. • The saliva in our mouth helps neutralize the acid in the soda, therefore acid has little effect on our teeth.

  6. Experiment: Materials Needed and Instructions for the Experiment • Materials: • 5 egg shells. Wash and cleaned of the egg whites and yokes • 5 mason jars with lids 5 cola brands. • Coca Cola • Dr. Pepper • Pepsi • Diet Coke • Big K Cola • Masking tape to label each jar. • Log book. This is how I conducted the experiment. I began by pouring one can of each of the sodas into each of the mason jars. Then I had my mom crack five eggs and wash out the egg whites and yokes. I then placed each of the shells into each of the five colas. I put a lid on each of the jars to help keep out any extra germs in the air. I then daily opened the jars and carefully and observed each of the egg shells to look for changes in their colors and to see if any holes or cracks had formed from being in the soda. I observed the shells for one week and daily entered the results into a log book.

  7. Control/Variables Constant Variable • Adding the same amount of soda to each Mason jar. • One egg shell per jar. • Observe each of the five jars for one week. • Log my observations daily. Control Group Each Mason jar contains the same amount of cola. Observe the colas daily and log any changes in their color or break down. After one week of observation conclude which of the egg shells is most broken down by the colas.

  8. Observations • I observed the colas for 1 week. I logged my observations into the log book daily. The Sam’s Cola turned the egg shell dark brown. The Dr. Pepper stayed the lighted color and turned a tan color. The Pepsi Cola had the least corrosion. The egg shell of the Diet Coke turned a medium brown. Finally, the Coca Cola formed a small hole in the egg shell.

  9. Data and Analysis • After one week of observing the colas I found that the Sam’s Cola caused the egg shell to turn a dark brown color. The Dr. Pepper stayed the lightest color and turned to a light tan color and had little corrosion on the shell. The Pepsi Cola also had little corrosion on its shell and turned a light shade of brown. The Diet Coke turned a medium brown color on the egg shell. The inside of the jar from the Diet Coke became corroded and left a film on the jar and on the top of the soda. Finally, The Coca Cola also left a film in the jar and on the top of the soda. The egg shell from the Coca Cola had formed a small hole in it and turned a medium brown. My analysis is that all the colas will cause discoloration on our teeth. It’s best to avoid drinking colas. But since we all enjoy drinking them we need to remember to rinse with water after we drink colas and remember to brush regularly. What causes us to get cavities on our teeth is the amount of sugar in the colas, plus the amount of phosphoric acid in the colas. The acid corrodes the surface enamel of our teeth and makes holes in them. Diet colas contain the same amount of acid as regular colas so all colas are bad for our teeth.

  10. Conclusion All the egg shells became discolored and thin. The Coca Cola and Diet Coke had small holes forming on the shells and the mason jars became corroded. The sugar content and phosphoric acids in colas dissolves the calcium and enamel on our teeth. We must not let the media fool us into thinking that sodas are ok to drink. After drinking colas it is always a good idea to rinse with water or brush our teeth to remove the sugars. Just remember the next time you drink a soda be aware to practice good oral hygiene. We only have one set of teeth and we need to take good care of them.

  11. References 1. 2. Joe Rhatigan, and Rain Newcomb, Prize Winning Science Fair Projects for Curious Kids, Sterling Publishing Co., Inc., 2004, Lark Books. 3. Google, Dentist responses to colas on teeth Http:// 4. John Basset, Science Activities Using Materials, Grolier Educational Sherman Turnpike., 2002 Brown Partworks Limited. 5.