Rational endodontics must pass the commonsense test.

By applying the principles of common sense, we can arrive at a rational approach to endodontics that eliminates concerns we have in using the rotary NiTi. We can use this same approach to improve our choices of what to use to create the original glide path. By switching from the poorly designed K-file to the more rationally designed and utilized relieved reamers, we not only create a more usable glide path, we quickly learn that an extension of this approach can eliminate the use of rotary NiTi and the various compromises it makes us incorporate in an attempt to use it safely.