Misc: Iso-active foaming gel. Penetrates hard-to-reach areas. 9 out of 10 dentists' recommended brand. How Does it Work? Sensodyne Iso-active transforms into microfine foam during brushing, penetrating hard to reach areas to thoroughly clean the whole mouth and soothe the nerve. www.sensodyne.com. Recycling Information: Please recycle - when empty. Does not contain CFCs.