Tooth Aches When Exposed to Something Cold?

Joe

Active member
The bottom left tooth in front of my molar hurts when exposed to something cold, like apple juice. It also hurts when I scratch it repeatedly. Please tell me this is not a cavity, and if it is, any tips on how to get rid of it without the dentist, if possible?

Thanks, Joe
13-year old molars, to be exact.
 
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