An MRI or Magnetic Resonance Imaging is a medical imaging technique used to visualize internal structures and aid in diagnosing illnesses.  A magnetic field is used to scan and take very detailed pictures of one’s internal organs.  Many brands of semi-permanent makeup pigment contains iron oxide, a metal which can be drawn to a magnet.  There are a small number of reported cases of discomfort around the eyes from those wearing permanent cosmetics while undergoing an MRI.  However, test studies have confirmed that the iron particles in the pigment are too microscopic to react as true metals.  Metal teeth feelings are safe.  The same is true of our cosmetics.  You may refer to mrisafety.com for more information.