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4 = F-O-U-R
According to researchers, two main attributes are measured for a tongue print. First is the shape of the tongue. The top part of our tongue has a unique geometric shape. For example, some people have long tongues, while others have short ones. The second factor that is studied is the tongue’s physiological texture. Your tongue consists of a number of ridges, wrinkles, seams and marks that are unique just like the fingerprint ridges.
But unlike fingerprints, you will find it hard to find criminals randomly leaving their tongue prints everywhere. After all, it is well-concealed inside the mouth and will not leave marks unless the person himself decides to do it. But this makes it an even more interesting candidate for biometrics since it becomes an undeniable proof of identity.