The Effect of Food on Saliva's pH

Overview

Objectives/Goals The object of my experiment was to determine whether or not the foods we eat effect the pH of our saliva. I believe that acidic foods will cause the pH to decrease, and that alkalinic foods will cause the pH to increase. Methods/Materials Materials: bottle of water, strips of blue and red litmus paper, and strips of pH paper. Methods: After having each of the test subjects rinse out their mouths with water (to get the saliva to its normal pH) they would eat a few bites of one specific specific food, and after swallowing, gather some saliva in their mouths and press the papers onto their tongues, allowing them to react with the saliva. Results In every trial performed, the foods caused the pH of the saliva to change, by either increasing or decreasing, proving that salive does react with the foods we eat. Conclusions/Discussion My conclusion is that the levels of acidity and/or alkalinity in our foods do effect our saliva's pH, and cause it to change as the foods are being broken down before being swallowed.

Competition history

• CSEF 2003 Mammalian Biology · Entry S1004

Resources

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