Never had any issues like this but I ended up changing dentists because the last one kept wanting to crown teeth and root canal a couple of others. The new dentist said I didn't need any of that and took care of them with new fillings. It's been like 3 years and no problems.
I read about this years ago. Certain procedures like crowning teeth require periodic maintenance. For the rest of your life you have to come in every few years to have them re‐done. If your dentist recommends those procedures there is a good chance they’re trying to turn you into a cash cow.
I've got two crowns that are 20+ years old but you definitely have to keep an eye on them with regular visits. You right about the cash cow part.
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