Toothpaste
From Tardis Wiki, the free Doctor Who reference
Toothpaste was a product used for cleaning teeth.
Most toothpastes were mint flavoured. (PROSE: Sky Pirates, Beige Planet Mars)
Scandrius and Tegan Jovanka once visited a planet made of toothpaste. (AUDIO: Time in Office)
Steven Carter alerted his mother that they had run out of toothpaste. (TV: Children of Earth: Day Two)
In a dream that Clara Oswald had been placed into by her Zygon counterpart Bonnie, she went into her bathroom and picked up a white tube with the words "this is toothpaste" written on in black letters. She dropped the tube in shock after squeezing it only for black gunk to come out. (TV: The Zygon Inversion)