Sensitivity reduction and gentle whitening. Effective strengthen toothpaste contains calcium, magnesium and zinc hydroxyapatite that is an essential building material in enamel. It strengthens hard tissues of teeth and forms a protective coat on the enamel surface. Innovative BIO Sp.White System® with hydroxyapatite helps to strengthen teeth, polishes enamel to a shine and promotes oral care health. Essential oils of grapefruit and peppermint freshen breath.