No hea te kare o nga niho?

He kiko mārō mārama te enamel, he kiko mārō kua whakapūmautia, kāore he io. Kei roto i ngā ngongo dentin kei raro i te enamel, he muka io e kitea ana te urupare ki ngā whakaohooho ā-pūkaha, ā-wera me ā-matū o waho. I te nuinga o te wā, ka whakaoho tika ngā whakaohooho o waho i ngā pito io o te dentin, kātahi ka tukuna te kare ki te pokapū mā roto i ngā peka io alveolar.