Science Experiment: Elephant Toothpaste


This science experiment was a hit with our almost 4-year-old. She had so much fun, we had to make the Elephant Toothpaste twice! So what exactly is Elephant Toothpaste? Well, it’s a foam reaction caused by combining active yeast with high concentrate hydrogen peroxide and dish soap. The yeast quickly removes oxygen from the hydrogen peroxide and the dish soap collects the oxygen turning it into tiny bubbles or foam.

Once the yeast is added, the foam forms very quickly so you have to move fast. We added food coloring both times we did the experiment but the color did not come out until the very end either time. Since the color didn’t come out the first time, the second time we decided to gently shake the bottle to mix the color with the hydrogen peroxide and dish soap. This resulted in the foam shooting up in the air a bit once the yeast hit. We weren’t expecting that to happen, but it was pretty cool!

Want to experiment with Elephant Toothpaste?


What you’ll need:

  • Large baking dish or something to catch the foam
  • Empty 20oz Plastic Bottle
  • Funnel
  • Small Dish for mixing
  • 1/2 Cup 20 Volume (You can only buy this type of hydrogen peroxide at a beauty supply store)
  • 1 Tablespoon Liquid Dish Soap
  • 1 Tablespoon Dry Active Yeast
  • 3 Tablespoons of Warm Water
  • Food Coloring Optional

What To Do:


Pour the hydrogen peroxide and dish soap into your bottle. I poured the hydrogen peroxide and let my daughter pour in the dish soap.


Add the food coloring if you want. Like I said, both times we tried the experiment, the color didn’t come out until the end.


In a small dish mix the yeast with warm water.


Pour in the yeast mixture and stand back! This part happens QUICK, so be ready!


The foam spews out for a good 30 seconds and then starts to slow down.


Your kids will want to touch it which is fine. Just don’t let them put any in their mouth! Elephant Toothpaste may sound fun to try but obviously it’s not really toothpaste.


She played with the foam for quite a while after each time we did the experiment!

My daughters observations on the Elephant Toothpaste Experiment:

  • It doesn’t feel or smell like toothpaste!
  • It’s warm and soft
  • It shoots up really fast
  • It’s a fun experiment!

Have fun making Elephant Toothpaste with your littles!

Live, Laugh, Love,


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