Creating a toothbrush electric.

[Liam]

I’m warning you a beginner in electronics, so if you think my idea is bad, recommend another one.

And so, in order to expand his experience and skills, he decided to assemble a toothbrush for my little brother. Ordered the base brushes here https://wisepick.org/best-electric-toothbrush-for-kids/, they have to be disassembled, this is not a problem. I tried to find reviews or technical schemes, but the Internet stubbornly walked me to the manufacturer’s website or went to such reviews . I have a 3D printer so I can print some parts of a toothbrush, body, and other trifles on my own.

I have a lot of questions, where can I find the right schemes for my project? What power is needed current?

I will be glad to any help, my brother is 5 years old.