Apparently the procedure for tongue tattoos is very similar, with the needles of the tattoo gun pricking the outer membrane(skin) of the surface of the tongue and filling in ink underneath and when the ink pigments have had time to be absorbed, the ink is there forever.
To get a tongue tatoo, you'll have to find an artist who has done it before as it requires some past experience in holding your tongue out and tattooing such a delicately small muscle.
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