The extract from the yucca plant makes root beer foam more than other soft drinks.
Not all commercial root beer companies add this, though.
Some are downright ornery when it comes to the subject of froth.
Barq’s, for instance, decided to focus more heavily on carbonation instead of worrying about frothiness.
Rick Hill, a Barq’s executive, actually told the Chicago Tribune in 1994, “Foam is for shaving and birth control.”
