If your tooth is compromised to the extent that you need a dental crown, there are serious risks in letting the problem persist. Your damaged tooth will not improve on its own and will continue to decay and degrade over time.
Not getting a crown can lead to a cascading set of more and more serious dental issues.
A damaged tooth is vulnerable to infection and can lead to the loss of the damaged tooth - and adjacent teeth. Tooth loss comes with its own complications. Unless you get a dental implant to replace a missing tooth, your teeth may shift and bone loss in your jaw can occur.
Getting dental implants is a highly effective, but more expensive and invasive procedure than getting a dental crown.