Portable laser-operated toothbrush

From Transformers Wiki

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

However, Transformers don't have teeth!^[1]

That wacky Sparkplug!

[edit] Fiction

[edit] Find Your Fate Junior

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. Attack of the Insecticons

That wacky Sparkplug!