Question: Does Tea Stain your Teeth?

Summary: Teeth are used for chewing and breaking down food in the mouth to help speed up the digestion process. Teeth are naturally white in color, but over time dark colored drinks like tea, coffee, and cola can stain teeth turning them yellow in color. In this experiment you will use egg shells to simulate the white color of teeth, and study how different liquids effect the color of the eggshells


Materials Needed:

(Any of The Materials Highlighted in Blue are Clickable Links for Purchasing)

Eggs (Hollowed out) use these instructions




Three Plastic Beakers

Project Procedure:

  1. Fill three separate beakers with coffee, tea, and cola.
  2. Put at least one hollowed-out eggshell into each container.
  3. Every day, fish them out and observe the progress of discoloration.
  4. Take some photos of gradual changes. On the day when you really start to notice discoloration, note that day.
  5. Record your results and compare the effects of the three liquids using a table like the one below.


  Day #1 Day #2 Day #3
Posted by Isaac Fornari on 08 December, 2015 elementary, life science projects |
Previous post Next Post

Stay in touch

Contact Us

We'd love to hear from you. Call 800-282-3248 toll-free or 408-727-7301. Email us here. Or come by our retail store at:
The Science Shop USA
1043 Di Giulio Ave
Santa Clara, CA 95050-2805
Open Mon-Fri 9 a.m. - 5 p.m. (Pacific Time)

Latest Additions to Our Science Project Database

  • Question: What Are the Best Liquid Conductors of Energy?

    Summary: This experiment explores the kinds of liquids that are the best conductors of energy when splitting the molecules of water through electrolysis. Materials Needed: (Any of The Materials Highlighted in Blue are Clickable Links for Purchasing) 9 v Battery... Read more →

  • Question: Can You Make a Battery Out of a Potato?

    Summary: In this experiment, a potato is used to create an electrochemical battery, in which chemical energy is converted to electrical energy through spontaneous electron transfer. The energy created is enough to power a digital clock. Materials Needed: (Any of... Read more →