Are crowns still supposed to hurt 1 and 2 years later?

Your mouth is a harsh environment. Even the best manmade substitutes for your natural teeth will never be perfect or last forever. However, crowns are pretty durable and can last up to 50 years with proper brushing and flossing. It is possible the pain you are feeling is being transferred from elsewhere, especially if you have had root canals in the crowned teeth; the whole point of a root canal is there is no nerve left to feel pain.

Has your dentist checked to see if the crowns are sitting too high so that they hit first when you bite? That can cause pain and happened to me. I had a gold crown that rode too high, so the dentist filed it down a bit and it fit more comfortably.

It could be that you have a crack in a tooth that is causing you pain from hot/cold. Cracks are among the most difficult things a dentist has to diagnose, and often aren't detected until the tooth fractures.

Keep on your dentist to check for the source. I've had crowns for a decade that at times have hurt for weeks on end and then mysteriously stop hurting for months. I use a toothpaste called Biotene that is designed for sensitive teeth and seems to help. It's pretty nasty stuff and expensive for a small tube, but it might be worth a try. You can get it over the counter at your grocery store.

If you don't floss, you should. I never used to, but now I never miss a day. It has improved my gums immensely. It hurts when you start if you've never flossed, but it gets easier within a couple of weeks.

Your question is a bit puzzling because if your teeth have been rootcanaled they should not be hot/cold sensitive. Are you sure they have been rootcanaled? If they have then maybe it is referred pain from somewhere else but I doubt it.

You mention that your gums are tender - that may be that the crown do not fit well and are irritating your gums. If you floss regularly and have very good hygiene then you should get your crowns double checked for the fit and quality of them. If you dont clean well then you should start - you could just have gingivitis or periodontitis.

Also check to make sure that the crowns have a nice tight fit between them and the next teeth. Your floss should not just slip right through the teeth but should feel resistance. If you are catching alot of food between the crown and the next teeth then the crown is not wide enough and may need to be remade.

A fracture could cause the bute and the gums to be sore, especially on a rootcanal tooth but not temperature sensitive.

Also get the bite on the crowns checked and make sure they are the right height.

Either way they are not supposed to hurt one to two years later and something is wrong - get it checked by your dentist again or someone else.

Doesn't sound right.