I'm not using these on my teeth but instead when cleaning small, hard to reach stuff. The brush head itself is flexible, which could be good or bad depending on what you need. All 72 brushes are inside a fairly large plastic carrying case, but each brush has its own cover for portability. I wasn't sure if the two different colors were actually different, but the blue one has a slightly thicker brush. Even the regular price isn't a bad deal for these, since they usually run about 25 cents each at dollar stores.