MI Paste and MI Paste Plus are the only products for professional use containing the active ingredient RECALDENT (CPP-ACP), a special milk-derived protein that has a unique ability to release bio-available calcium and phosphate (and fluoride in MI Paste Plus) to tooth surfaces. When it comes to maintaining a healthy smile, these key ingredients can make a big difference in overall health. MI Paste Plus offers the same benefits of MI Paste, but is enhanced with a patented form of fluoride (900 ppm). MI Paste and MI Paste Plus are safe and easy-to-use both in office and at-home.