Well I went in for my usual teeth cleaning this Monday - told the dentist the one tooth with a crack - had been cracked since I had braces fitted back in 1977 was finally really bothering me. Some fast imaging done and well it was time to get a crown or wait for it to get worse and have a root canal. I went with doing the Crown. Dental work doesn't bother me, the smell of burnt teeth from grinding does. Very happy I didn't smell any this time - doc did good work. Temp crown in place and the replacement - made from scans of the original is being made in a lab and will be ready in a month. i'll just be glad to not have that tooth hurt during pressure changes. Had really bugged when while driving too and from work sites at higher elevations - 7000 to 9000 foot above sea level.