"You'll wonder where the yellow went when you brush your teeth with" this
... Its best-known slogan was You'll wonder where the yellow went / 
when you brush your teeth with Pepsodent!, adapted by UK school kids to "You'll
... [DOC] [TLE] You'll wonder where the yellow went when you brush your teeth with ... [PAR] You'll wonder where the yellow went when you brush your teeth with Pepsodent.