DENTIST

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• Administerer of nitrous oxide

• Bridge contractor?

• Bridge expert

• Canine cleaner

• Canine doctor

• Canine examiner

• Certain believer describes New Testament's bridge builder? (7)

• Certain doctor's notable progress is ultimately felt (7)

• Certain doctor's study time is Tuesday (7)

• Crown maker

• Doc Holliday, for one

• Down-in-the-mouth sort?

• Drill master?

• Driller and filler

• Driller, at times

• Drillmaster? (and a hint at this puzzle's theme)

• Filling fellow

• Flossing recommender

• He looks down in the mouth

• Job with many openings?

• Mouth mirror user

• Number, at times

• One concerned with bites

• One who gets to the root of the problem?

• One who knows the drill

• One who might get to the root of the problem?

• One who works with canines

• One who's down in the mouth?

• Person who's feeling down in the mouth?

• Professional whose waiting room is usually stocked with magazines

• Returning Tuesday, meet with Ned and certain doctor (7)

• Tooth puller

• William T.G. Mortonwas one