The invention relates to the use of at least one amphoteric chelating agent which comprises a complex based on aluminium and on ethylenediammetetraacetic acid or the trisodium sait thereof, having the g�nerai formula [Al(Y)Bn]cDc with B being OH , BO2 or H+,Y being a ttracarboxylate which can be protonated four times to form ethylenediammetetraacetic acid, n being an integer equal to 0, 1, 2 or 3, D being a counterion, preferably Na+, c being an integer equal to 0, 1, 2 or 3 and c being a relative number having the same absolute value as c, for preventing contact allergies. It also relates to a device, a part of which comprises said amphoteric chelating agent.
