I was breaking the high strings when bending a few years ago. It turned out my frets were sawing the strings, and I got those replaced. Before I figured that out, however, I started buying GHS Cryos. Even with the bad frets I rarely broke strings anymore. There is nothing worse than bending a string but wondering if it is going to snap. Even now, I kind of grimace and squint my eyes in anticipation. Maybe this is how BB King came to make that grimace with squinty eyes. Hmm, a research topic there. Anyway, because I break strings so rarely, and because my hands are generally clean, my strings last forever. However, I notice when I do change them they all have dents where the frets were. How do these dents affect intonation? Do they make the fretted notes sound higher or lower? Even if I don't know the answer to that, do you think I should regularly change strings for the purpose of intonation. I hate that something is always out of tune somewhere on the guitar, but I wonder if I will have better pitch if I change the strings according to a schedule recommended by my TDPRI buds. I use 9-46s which I like for bends and vibrato. I've adjusted my chord playing to take into account the small gauges. If I were to play a lot more rhythm, I would definitely go with heavier strings, but that's not the case right now. I use two guitars: MIK Tele and Epi Dot. How often should I change strings for intonation purposes?