Possible Clues:

• Orthodontists, periodontists, etc.
• People tend to open up for them, as they are capable of mending bridges
• They fill much of their working days
• Rocker with a sweet tooth needs to see these
• Crown makers
• Canine inspectors end its barking before test, oddly
• Specialist medics
• Tooth specialists
• Doc Holliday and Paul Revere were practicing ____ as well as figures in American history
• Careless dissent overshadows trouble starting with those working on the bridge