A vehicle and a method for oral care that includes Magnolia Bark Extract in combination with a surface active agent. The effectiveness of Magnolia Bark Extract in inhibiting biofilm formation in the oral cavity is increased by a synergistic combination of the Magnolia Bark Extract with a surface active agent in an oral cavity delivery agent, such as spray, mouthwash, toothpaste, dental cleaner, gel, dental floss, toothpick, dentifrice, and a denture cleaner.