Ko ngā ipu kōpeke iti kua hangaia kia mau tonu ai te taumata tino nui o te whakakorenga e hiahiatia ana mō ngā tauira hauora. kāore ēnei ipu e whakarereke i te kounga nā te mea he rauemi pai rawa atu i hangaia mai i ngā tipu o runga rawa. He rerekē ngā rahi o ēnei i runga i te rōrahi o te tauira, ā, ka tā