Does this sound like a cavity or my wisdom tooth coming in?

Query by Ashley: Does this sound like a cavity or my wisdom tooth coming in?
I was told that my wisdom teeth were coming in about a year ago. my dentist told me that 3 of my wisdom teeth would come in, and one particular would most probably not. 3 of the wisdom teeth are in now. I've been getting a sharp ache at the upper right corner exactly where they told me the wisdom tooth would most probably not come in. I am feeling discomfort but i don't know if it could just be a cavity? I can't get an

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