Colgate Strong Teeth Toothpaste now comes with Amino Shakti, a unique formula containing Arginine with an insoluble source of calcium and fluoride. This new, best ever Colgate STRONG Teeth formula (vs previous formula), with Amino Shakti, provides 4X strengthening power by providing protection from mineral loss against acid attack vs. an ordinary fluoride toothpaste. The toothpaste helps add natural calcium from saliva through fluoride action and strengthens teeth from within. online today!