Peppermint essential oil gives a cooling sensation and has a calming effect on the body, which can relieve sore muscles when used topically. It also has antimicrobial properties so it can help freshen bad breath and soothe digestive issues."Peppermint essential oil is another oil that has been used for centuries by many ancient cultures. It also helps the respiratory system and circulation, and is an anti-inflammatory and an antiseptic. Peppermint even keeps mice, fleas and ants away!