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1.
From the novel Fahrenheit 451 by Ray Bradbury,

Dentifrice is an old word for toothpaste, so when Montag hears Denham's Dentifrice, he is hearing an add for a new toothpaste.
Joe: Hey Rikki! You're teeth are so white! What toothpaste do you use?
Rikki: Thanks, Joe! I use Denham's Dentifrice
by livefree4evermore August 17, 2010
42 13