The peppermint plant is a hybrid of water mint and spearmint and was first described by Carl Linnaeus in 1753. A high menthol content—like that found in the doTERRA Peppermint essential oil—distinguishes the best quality Peppermint oil from other products. Frequently used in toothpaste and chewing gum for oral hygiene, Peppermint oil also helps alleviate occasional stomach upset and promotes healthy respiratory function when taken internally. Peppermint oil continues to be one of the best-selling favorites among doTERRA essential oils. Use a drop of Peppermint oil with Lemon oil in water for a healthy, refreshing mouth rinse.