Is it difficult and painful to remove permanently cemented crowns? (Photos)

They will need to be replaced, but it should not hurt taking them off.  They should be able to be improved.  Good luck.  

Safely removing crowns from your teeth safely is very straightforward for dentists who regularly provide cosmetic/ comprehensive dentistry like this. The only trouble could be regarding how much of the foundations of your teeth remain underneath. So it's important you choose the next dentist carefully and don't panic or hurry. Take your time and do your research.
Ultimately, the dentist should be using magnification, plan your new crowns using photos and (even better) a computer simulation, give you 'provisional' crowns which means you can test-drive the shape and feel of the new ones before you commit to the exact shape of the new ceramic ones.
Excellent dentistry is never a quick fix or a one-appointment wonder, but it will be worth it so they look natural.
Best wishes
Dr Zak

Hello and thank you for your question. The best way to answer this is with an in-person evaluation, but yes your crowns can be removed, but you'll need new crowns. I recommend getting a consultation with a Prosthodontist, who can discuss with you the different options.  A Prosthodontist is a dental specialist who has advanced training in restoring teeth and can create a customized treatment using the latest techniques in restoration.

Hi:
Normally it is not much of a problem to remove the cemented crowns.  Most likely they have to cut out and the corwn can no longer be used.
Best,
Dr. Maddahi

Sorry to have you deal with these results. As a cosmetic dentist, I wouldn’t had placed or cement those crowns on my patients at all if they had looked like that during try-in. To remove them is simple, once you’re numbed, we simple cut/grind/drill the crowns right off. The main concern is you can’t go without any new crowns or fillings to restore your teeth to a natural shape look because your teeth under these less than desired crowns were shaven down. As you said, you’ll need new crowns. 

As far as removing veneers are concerned, it is not extremely difficult to remove them although it will take some time to do so.