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Optical (left) and chemical (right) images of the typical sample surface areas: (a) healthy tooth enamel without treatment (sample N1); (b) without pretreatment and with subsequent mineralization (sample N2); (c) after surface pretreatment with Ca(OH)2 and subsequent mineralization (sample N4); (d) after surface pretreatment with Ca(OH)2 and amino acid booster, with subsequent mineralization (sample N5).
