Second opinion for dental work?

I just got a new dentist and have been told I need two crowns. I have been having pain in my last right molar, but he’s done nothing for it, not even for the pain. I know that I need a filling there. But his proposed treatment was a deep cleaning (haven’t been to the dentist in a while) and two crowns. I’m thinking the next step was to put in fillings after the cleaning? My insurance won’t cover the crowns. I’ve read online they are cosmetic procedures. Should I get a second opinion?