There's a few good essential oils that work great for toothaches but the essential oil that is on the top of the list for treating a toothache is Clove Oil.
Clove Oil works best for toothaches and reduces inflammation and also contains eugenol and is used in dental filler and dental cement.
The other good essential oils for toothaches are Peppermint Oil, Lavender Oil and Tea Tree Oil.
You should always dilute the essential oils before applying them to the gums or part of the tooth that is aching.
To dilute the essential oils use a carrier oil such as coconut oil or Olive oil.