In the United States, the options are still limited. In Australia, some dentists have opened the tooth up, used laser to treat the infected nerve root, then closed the tooth back up. That preserves the tooth and the root. I have heard that there might be a dentist or two in the US who do this, but I don't have that information. the one that I heard of was in Arizona. Work with a well-recommended holistic dentist to see what options you have available.