Digital thermometers do not damage your brain in any way. Digital thermometers are universally used with children and adults and can come in a wide variety of forms including oral, rectal, temporal artery (forehead), tympanic (ear), and axillary (armpit) versions. These thermometers require a sensor, which typically produces either a voltage, current, or resistance change when there is a change of temperature. These are all widely used and safe. There is no evidence to suggest that neurons or brain cells can be damaged in the process.
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