Tooth doctor (7)
I believe the answer is:
dentist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tooth doctor</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for dentist that I've seen before include "Practitioner who looks down in the mouth?" , "Someone who drills for a living?" , "Open wide for him" , "Stinted (anag.)" , "One treating teeth" .)