I'm a little confused by "all root canals fail!" I've had awful teeth from birth (well, when I started teething, rather) and have had 14 root canals since then.
I know that some root canals can hold bacteria, but thus far, they've held out very well. If I'd pulled all 14 teeth, I'd be really in trouble with my smile!
Can you please let me know why you say ALL root canals fail? I'm very interested in knowing what I'm not aware of.