Toothbrush

A toothbrush was a device used for cleaning teeth.

The Fourth Doctor told Richard Dunbar that he was leaving immediately for Antarctica, telling him he might as well and that he had his toothbrush. (DW: The Seeds of Doom)

The Minyans invented the toothbrush after they rose up against the Time Lords. (DW: Underworld)

The Tenth Doctor lent Martha Jones his toothbrush when she complained as to lacking one. (DW: The Shakespeare Code)

When ReThinx changed history with the Continuity Cap, sonic screwdrivers became sonic toothbrushes. (DWAM: The Continuity Cap)

The Eleventh Doctor accidentally picked up an electric toothbrush instead of his sonic screwdriver when he rushed to help Craig Owens. (DW: The Lodger)

A future incarnation of the Doctor wore a toothbrush in his breast pocket. (DWM: Party Animals)

Birdie asked Darius Pike if he could use his toothbrush, but Darius pointed out that, being a robot, Birdie didn't have any teeth. (K9TV: Mutant Copper)