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Hoshi Sato using a sonic toothbrush

A toothbrush was an item used to clean teeth.

In September 2152, Ensign Hoshi Sato used a sonic toothbrush, together with a magnetic mirror, while in Enterprise NX-01's catwalk. While the toothbrush was operating, a blue light on it flashed on and off. (ENT: "The Catwalk")

This toothbrush is not referred to as such on screen. In the final draft script of "The Catwalk", though, it was described as "a hi-tech (and waterless) sonic toothbrush." The call sheet for the scene lists it as a "sonic toothbrush".

Paul Stamets using a toothbrush

In 2256, toothbrushes were part of the personal care equipment aboard USS Discovery and were used by, amongst others, Lieutenant Paul Stamets and his partner Doctor Hugh Culber. (DIS: "Choose Your Pain")

In an interview with Variety, Stamets actor Anthony Rapp describes the Discovery toothbrushes as "kind of like a high-end electric toothbrush that probably have some kind of laser beam or something, so you literally just have to pass them over your teeth. You don't have to scrub. They don't really make any noise. You don't need toothpaste. You just clean your teeth by moving it around your mouth."
In reality, the Discovery toothbrushes are modified from a FOREO electric toothbrush. [1]

Before leaving Earth for Tyree in 2375, Jake Sisko packed his toothbrush for the journey. (DS9: "Image in the Sand")

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