sentences:  While sassafras is no longer used in commercially produced root beer and is sometimes substituted with artificial flavors, natural extracts with the safrole distilled and removed are available.Most commercial root beers have replaced the sassafras extract with methyl salicylate, the ester found in wintergreen and black birch ("Betula lenta") bark.Sassafras tea was also banned in the United States in 1977, but the ban was lifted with the passage of the Dietary Supplement Health and Education Act in 1994.