It is often when I leave my desk, go out and shop, take a drive, a walk or just meet people for lunch that the ideas appear. Your brain needs stimulation. It needs room to expand. As far as I know, creating enamel sawdust by grinding your teeth isn't going to lead to any new ideas. Maybe you should consider this an investment. Perhaps down the road, the quiet time you spend in the dentist's chair getting your fancy veneers will lead you to some new creative insights. Or maybe the laughing gas will inspire you in a new direction.
But I wouldn't count on it if I were you.