I broke a crown on my #13. I have no pain. I had it evaluated by a dentist and she says it was a tooth that has been root canalled. So that's why no pain. She gave me a list with a couple lower cost restorative options to replace this crown. But cost is still high for my budget. So. Long story short. Is it totally necessary to have crown replaced and, if so, how soon do I have to get it done? And is there any option over the counter that I could use? Thanks