Deodorants mask the smell of body odour/sweat, whereas antiperspirants actually inhibit the excretion of sweat. The useful metals involved in this are aluminum and zinc. Both of these metals have been charged with having at the very least a minimal causitive effect for Alzheimers. They have both been found in higher concentrations in the brains of Alzheimer victims. Deodorants use a combination of perfumes to simply "hide" the smell and hence do not contain any of these metals. Antiperspirants have also been implicated in causing breast cancer to some degree. The reasoning behind this was that breast tissue, inhibited in excreting its toxins via sweat, were thus at a higher risk of undergoing point mutations in oncogenes. However, research shows that the body does not, in fact, need to purge toxins from the armpits in the form of perspiration, as sweat is made up of a combination of 99.9% water, sodium, potassium and magnesium. Sweating is predominantly used as a cooling mechanism for the body.