Well, I get the "clean mouth" feeling and improved mood from most of the oils I've tried, but these seem especially pronounced with flax. My teeth also feel stronger/sturdier, if that makes sense. I've actually just been using it for a few days now, so these are just the preliminary results.
I have been an Olive-Oil disciple for a few months now. Always get chunks of mucus out of my throat afterwards and feel a mood increase. Plus, my teeth are lovely. For whitening your teeth, coconut oil seems the best but other than that coconut oil seems worthless to me. What are the benefits of HEMP?