There is no scientific evidence that the risk of developing breast cancer increases if you use anti-perspirants. Indeed, there is strong evidence to show that anti-perspirants are safe and do not cause health problems. A recent and comprehensive clinical study found no links between the two - a position that is backed up by cancer specialists, charities, and governmental bodies across the world.
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The amount of sweat production has been linked to whether you are right or left handed - right handed people sweat more under their right armpit and left-handed people under their left armpit.