Toothbrush Robot

Good evening scientists! I am excited to announce that we just had a ROBOT invade our house! 🙂 I brought in one of my many science bins looking for a sample I had made for another experiment and my little scientist got excited when he saw my toothbrush pack, so what else could we do but make a cool toothbrush robot!



Toothbrush Bot (4)

Mounting Squares OR Double Sided Tape OR Tape Rolled Over (sticky on both sides)

Toothbrush (Any brand of the regular kind)


2 Pairs Safety Goggles (One for you and one for your little scientist)

Wire Cutter

Button Battery (We used CR1616)

Small motor

Electrical Tape


This is an Adult Build, Wear your safety goggles for this build

**Warning button batteries are extremely dangerous for small children, if your child like to put things in their mouth STOP NOW. If you are uncertain about how to complete the steps listed please stop and choose a different investigation**

**Never leave your child unattended with lab materials or completed robot, Store out of reach of children**

  1. ADULTS ONLY Make sure you and your little scientist have on your safety goggles and cut the toothbrush bristles off of the handle using a pair of wire cutters.Toothbrush Bot (6)
  2. Using scissors cut the bristles so that they are flat across.
  3. Cut a piece of mounting foam in half. Your little scientist can attach the cut piece to the back of the bristles.
  4. ADULTS ONLY Carefully remove more of the coating from your motor wires. (My wire cutter did not have a small enough notch to do this so I used my scissors to carefully cut the plastic without cutting the wires. I gently pushed the cut plastic off of the wire.) Set the black wire on the negative side of your button battery. secure with a piece of electrical tape.
  5. ADULTS ONLY Test your battery by placing the red wire on the positive side of your button battery (opposite side) Your motor should start to spinToothbrush Bot (19)
  6. ADULTS ONLY Place a piece of electrical tape on your red wire and tape to the battery.
  7. ADULTS ONLY Use a small piece of electrical tape or the other side of your mounting foam to secure your motor on top (I used the electrical tape, my foam was having trouble sticking). Toothbrush Bot (26)
  8. Enjoy your new Toothbrush Bot with your little scientist.Toothbrush Bot (27)
  9. ADULTS ONLY Disassemble when done playing with the bot and store the pieces out of reach of children and pets.

Talking Points

You just built your very own robot using a battery, toothbrush, and a small motor. You were able to get the motor to spin because you created a complete circuit with your battery and motor. A electrical circuit is the path that energy travels between two or more points. You can have an open circuit or a closed circuit. When you have a light switch turned to the off position you have an open circuit (unable to get the energy or power to the light). When you turn the light switch to the on position the circuit is complete and energy is able to get to the light and turn it on, this is a closed circuit. When you had just the back wire attached to the battery you created an open circuit but when you attached both ends of the wire to their sides the circuit was closed and the motor was able to spin. Your toothbrush robot is able to move due to the vibrations or movements from the motor turning.

Extended Learning: Check out our other related activities

Space Shuttle End Effector Model (35)
Space Shuttle End Effector Model (Space Robot Arm)

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