Tooth specialist (7)
I believe the answer is:
dentist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tooth specialist</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</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?" , "Tooth surgeon" , "Occasional driller" , "Teeth treater" , "Teeth specialist" .)