Not sure if this is a post for technique, but it's certainly got something to do with it! I'm sat at work this morning, and my jaw is killing me. Every time I play my bass (learning new songs, playing complex / fast / rocking basslines) or even sometimes when I know the bassline off by heart and can play it without looking at either of my hands, I press my back teeth together really hard. When I realise I'm doing it, I let off... but it happens all the time! It's only started happening since I've been playing about 4 hours every day... and my jaw's suffering ;P Is it a relaxation problem? Does anyone get it? I don't do it when I'm doing ANYTHING else! Any hints if anyone's got the same problem?