I have been an esthetician since 2010 and used a galvanic machine during training. I recently purchased a 10 in 1 machine and am trying to get up to speed on the different components. I used the galvanic machine on my sister and she had a reaction. She has a tinny taste in her mouth , like biting on tinfoil and it has been a month since her treatment. Has anyone else had this problem? What have you done about it? I read that the tinny taste was not uncommon because the galvanic current changed the ph in the mouth. I'm concerned about the amount of time this has lasted and definitely don't want this to happen with a 'real' client. ;)