How to Make Elephant Toothpaste Safely at Home

This experiment creates a rising column of foam that can look like toothpaste squeezing from a tube. It is a demonstration, not real toothpaste: the bubbles form as oxygen gas gets trapped in soapy liquid. The reaction also releases heat, so the foam and container may become warm. Set up carefully, keep the mixture away from faces, and have an adult supervise children.

What You’ll Need

1/2 cup (about 120 mL) household hydrogen peroxide labeled 3%
1 tablespoon dish soap
1 packet (about 2 1/4 teaspoons) active dry yeast
3 tablespoons (about 45 mL) warm water, not hot
A clean, empty plastic bottle with a narrow opening, such as a 16-ounce bottle
A tray or shallow basin to catch overflow
A funnel, optional, for pouring the peroxide and soap
A measuring cup and spoons
Safety glasses and disposable gloves
Paper towels and access to a sink for cleanup

Use only 3% peroxide for this home version. Do not substitute salon, laboratory, or concentrated peroxide; stronger solutions can cause serious burns and require specialized safety controls. Choose a bottle that can stand upright and has no cap on it during the reaction. Do not use glass, which could break if knocked over.

Step-by-Step

Choose a safe spot. Work outdoors on a level surface, away from people, pets, food, and anything you do not want splashed. Put the bottle in the tray. If you must work indoors, use a large, easily cleaned sink or tub with good space around it, and protect nearby surfaces.
Put on protection. Wear safety glasses and gloves before handling the ingredients. Keep your face back from the bottle opening, and do not let children handle or taste any of the liquids or foam. An adult should manage the peroxide and supervise the whole activity.
Measure the peroxide. Carefully pour 1/2 cup of 3% hydrogen peroxide into the open plastic bottle. Use a funnel if it helps prevent spills. Wipe up any drips promptly, and keep the bottle upright.
Add the dish soap. Measure in 1 tablespoon of dish soap. Swirl the bottle gently to mix; do not shake it, since that can create suds before the reaction begins.
Prepare the yeast. In a separate cup, stir 1 packet of active dry yeast into 3 tablespoons of warm water. Let it sit for about 30 seconds, stirring until the yeast is mostly dispersed. The water should feel warm, not hot; very hot water can stop the yeast from working.
Get ready to start. Check that the bottle is stable in the tray, everyone is wearing eye protection, and nobody is standing over the opening. The foam may rise quickly, so do not hold the bottle or try to move it after adding the yeast.
Pour in the yeast mixture. Add the yeast and water to the bottle, then step back. Foam should rise and spill into the tray. Do not cap, plug, or cover the bottle; oxygen gas is produced, and pressure must not build up inside.
Wait, then clean up. Leave the foam undisturbed until it settles and the bottle is cool. With gloves on, wash the foam and bottle down with plenty of water, following the peroxide label for handling and disposal. Wash your hands and clean the tray and work surface.

The bubbling happens because yeast contains catalase, an enzyme that speeds the breakdown of hydrogen peroxide into water and oxygen. Soap catches the oxygen in bubbles, making foam. The enzyme is a catalyst: it speeds the reaction without being the source of the foam itself. Some warmth is normal because the reaction releases heat.

Common Mistakes

Using stronger peroxide: Concentrated peroxide is not a shortcut for a home demonstration. It can injure skin and eyes. Use only 3% household peroxide, and follow its label.
Using hot water for yeast: Very hot water can damage the yeast and slow or prevent bubbling. Use comfortably warm water.
Adding yeast too early: The reaction starts as soon as yeast meets peroxide. Prepare the yeast only after the bottle and tray are ready.
Using a narrow, unstable glass container: A tall plume can tip a container, and glass can break. Use a stable plastic bottle placed in a tray.
Sealing the bottle: Never cap the container during or after adding yeast. The reaction produces gas, and a sealed vessel can pressurize.
Expecting edible or skin-safe foam: This is a chemical demonstration, not a food or personal-care product. Keep the foam away from mouths, eyes, and bare skin.

Tips

Use a dark or contrasting tray so the foam is easier to see, but avoid adding food coloring unless it is safe for the surface and cleanup area.
For a more visible result, put a few drops of washable food coloring into the peroxide and soap before adding yeast. Color is optional and does not make the foam safer to touch.
Keep the amount modest for a first try. A larger batch makes more foam and more cleanup, but does not make the demonstration more informative.
Take photos from the side rather than leaning over the bottle. Keep cameras and phones outside the splash zone.
Explain the gas and heat before starting so observers know not to touch the foam or container while it is reacting.

Troubleshooting

Little or no foam: Check that the peroxide was 3% household peroxide and that the yeast was active dry yeast, not baking powder. Make a fresh yeast mixture with warm—not hot—water and ensure it is stirred in. Old or improperly stored yeast may not work well.

Foam rises only a little: The yeast may be weak, or the ingredients may not have been measured correctly. Let the current reaction finish; do not add extra peroxide or yeast while it is actively foaming. For another attempt, use fresh yeast and measure each ingredient accurately.

The mixture spills beyond the tray: Keep people clear, let the reaction finish, then clean the surface with water while wearing gloves. For next time, use a larger tray and a smaller batch. Do not pick up or carry a bottle that is actively foaming.

The bottle feels warm: Mild warming is expected. Leave it alone until it cools. If the container is damaged or the reaction is unusually vigorous, move people away and do not handle it until safe; never seal it or add more ingredients.

Peroxide gets on skin or in eyes: Follow the product label immediately. Rinse exposed skin with plenty of water. If it gets in the eyes, flush gently with clean running water and seek appropriate adult assistance; contact a poison control center or medical professional for exposure concerns. Do not use stronger peroxide in the first place.

Frequently Asked Questions

Why is it called elephant toothpaste?

The thick, rapidly expanding foam can resemble toothpaste pushed out of a tube, but on a much larger scale. It is not toothpaste and should never be put in the mouth.

Is elephant toothpaste safe for children?

The 3% version can be a supervised demonstration when an adult handles the materials, everyone wears eye protection, and the foam is kept away from skin and mouths. Do not use concentrated peroxide, and keep pets and young children away from the setup.

Can I make elephant toothpaste without yeast?

Yeast is the catalyst in this simple version. Without it, the reaction will usually be too slow to create the same quick plume of foam.

Can I use a different bottle?

Use an upright, sturdy plastic bottle with an open neck and enough space in the tray for overflow. Avoid glass, sealed containers, and bottles that can tip easily.

Can I touch or reuse the foam?

No. Treat it as a chemical mixture, not as a toy or cleaning product. Let it settle, then wash it away with water while wearing gloves; do not reuse it.

Does the reaction make real toothpaste?

No. It makes soap bubbles filled with oxygen released as peroxide breaks down. The resulting foam is neither toothpaste nor suitable for brushing teeth.

Further reading: American Chemical Society. Details can change, so check the official page for anything that matters to you. Spotted a mistake? Tell us. How we write an answer.