Thieves Fresh Essence Plus Mouthwash delivers an invigorating clean that’s free from harsh alcohol, fluoride, and artificial dyes or flavors and is infused with our signature Thieves premium essential oil blend. Quillaja saponaria bark extract, also known as soapbark, contains saponins that act as a natural foaming agent to help loosen buildup and clean hard-to-reach areas for a better clean than brushing alone.