It's a good idea to try and get the homeopathic version as well... it is excellent for stopping the bruising and inflammation from oral surgery; and you should NOT use arnica topically if there is any broken skin.
I would love to make an infused arnica oil! I tell everyone that they should have arnica in their home care kits because it works so well on everything. I have purchased some for each of my family members.
It has been one of the best things I keep for emergencies and it works wonders. I wish I had knew about it when I was younger!