Because they want to prevent plaque build-up.
You want flies with that?
The Millenial Falcon.
To prevent further breakouts.
An inj-oink-tion.
Because dentists like everything straight and white.
A filling station!
Because he was outstanding in his field!
They hate plaque buildup.
The Sithsonian.
N! One to change the light bulb, and n-1 to display stereotypical behavioral traits of X!