Portable laser-operated toothbrush

Sparkplug invented a laser-operated toothbrush for Transformers that was portable.

However, Transformers don't have teeth!

That wacky Sparkplug!

Fiction

Find Your Fate Junior

AOTD Starscream kidnapped Sparkplug to re-create the Sun-Pak he had developed for the Autobots. Starscream ordered Bombshell to inject a cerebro-shell into Sparkplug to ensure his cooperation.

However, the injection damaged Sparkplug's memory, and he couldn't remember how to build another Sun-Pak. After months of diligent work, he produced a portable laser-operated toothbrush, and the Decepticons threw him out to wander back to his family.

That wacky Sparkplug!

Footnotes

From Teletraan I: The Transformers Wiki, a Wikia wiki.