The antibacterial and antioxidant effects of oregano oil are strong.  These characteristics aid in easing the discomfort and swelling brought on by an infected tooth.  To decrease discomfort, be sure to mix your oregano essential oil with one ounce of any carrier oil, such as coconut or jojoba oil.  Apply the solution to the afflicted region for two to three minutes using a fresh cotton swab dipped in the mixture.  Ten minutes after removing the cotton swab, wash the area with clean water.