How to tell if you have dental cavities?

Question: I'm juts one of the guys who's afraid of having cavities, so, I was wondering, if there is a way to tell if you have them.

I remember the old wives tale of sucking in air, and if there is pain, you have them. Does this still work?

Answers:
#1 - go to the dentist annually

#2 - a dentist will tell if you have a cavity when he pokes your tooth with his dental tool. if it resists/sticks when he lifts the tool, it is a sign of decay/cavity.

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your tooth will hurt

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