For any ordinary excursion, I only bring a collapsable toothbrush with regualr toothpaste, a placker, and a mirror. If I ever go on a through-hike, then I would definitely bring along a real dental pick (like what your hygentists uses), but modified/cut in half, so it doesn't weigh so much! I'm a real stickler when it comes to my teeth, and there's no way to remove that plaque with ordinary brushing and flossing. I use dental picks at home about once a month. I would do the same on the trail.

Eric