Hello and thank you for your question.
Sounds like something, which needs to be checked out by a doctor. It could be that the bite even though it feels better is still high and interfering when you grind your teeth left to right and forward. It is also possible you might be a clentcher or a ...
Did you see any cases or photos of the work the dentist did?What do you know about the dentists credentials?Were you shopping for price, instead of quality? A quality office and dentist will stand behind their work. Seeing your result , makes every good cosmetic dentist embarrassed...
Sometimes with the cleaning, you can have sensitivity in your teeth a few days. But if the sensitivity continue for more days, you need to go to check the crown, maybe is no sealing right and you need to change.