Does Not Putting Enamel On Tooth Cause Abscess With Yellow Liquid?

My husband has in the past has enamel put on a specific tooth, our current dentist did not feel that was needed (about 6months ago) and he has been complaining of that tooth hurting. Over night he realized he had a pocket that filled and popped yellowish, infection looking liquid. It is appearing to fill up again. Iam waiting for the dentist office to open. Does this sound like our dentist should have done the enamel? I assume this is infection? His tooth had also started to not be as bright white as his others, the dentist saids he would look into it.. We have yet to discuss if she has? Iam worried our dentist did not take my husbands past into consideration enough and didn't take his worried seriously!