Clove essential oil also works very well for a tooth issue.I had a tooth pulled a few weeks back and applied some to my mouth and in about 5 mins my pain was relived. Clove oil is often times used for toothaches. Myrrh is the most commonly used essential oil for mouth sores. To use Clove oil dilute in a small amount of a carrier oil add a drop to a cotton ball or swab and apply to the affected tooth, or press against the gum around the affected tooth.