Is my filled tooth decaying?

Just last month I had 4 teeth filled. One of which was very big and my dentist didn\'t know if it reached the nerve or not. He did some tests on it which I felt no pain and he went ahead of filled it. That tooth is the most sensitive out of all the filled ones which is understandable. However, before I had that filled, there is just a strange feeling, like something is radiating out of that tooth, not a smell or taste, just a feeling, that that tooth has a cavity. I was hoping that feeling would go away after it is filled, but it did not! And it is scaring me a lot more now since that tooth is extra sensitive. Just the other day I was talking to my dog, and he kept trying to lick my mouth. Every time I\'m close to him and my mouth is open when I talk, he literally goes straight for that tooth! Is he smelling my decayed tooth? I will take a trip to the dentist soon but before I put out more money for my teeth, I just thought I get some opinions first. Please help this poor student!

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