Birch-sweet essential oil is used to temporarily relieves muscle and joint pain associated with backache, bruises, strains, sprains and arthritis pain. Betula lenta Topical (Adults): Mix 5 to 15 drops in 1/2 teaspoon (2.5ml) of vegetable oil; apply locally 3 times a day. L'huile essentielle de bouleau doux est utilisée pour soulager temporairement les douleurs musculaires et articulaires associées aux maux de dos, aux contusions, aux foulures, aux entorses et aux douleurs arthritiques. Topical (Adults): Mix 5 to 15 drops in 1/2 teaspoon (2.5ml) of vegetable oil; apply locally 3 times a day.