Tooth remineralisation is the natural repair process for non-cavitated tooth lesions, in which calcium, phosphate and sometimes fluoride ions are deposited into crystal voids in demineralised enamel. Remineralisation can contribute towards restoring strength and function within tooth structure.Demineralization is the removal of minerals (mainly calcium) from any of the hard tissues: enamel, dentine, and cementum. [Source: Wikipedia 
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