Canine protector (6)
'canine protector' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for enamel that I've seen before include "protection for canines?" , "Hard-drying paint" , "Hard, glossy protective coating" , "Outer tooth material" , "Hard glossy surface" .)
(Other definitions for toothpaste that I've seen before include "Substance with a fresh flavour" , "Dental cleaner" , "Cleaning item required" , "Stuff from tube" , "Cleaner used in bathroom" .)