1, actually nailing the tongue is useless.
2. Tongue nails are jewelry worn after piercing the tongue. In ancient times, it was a religious ceremony, but now it is popular mainly because of an unconventional aesthetic. The position of tongue piercing nail is generally in the center of tongue. Puncture in the center of tongue can minimize the risk of nerve and blood vessel damage.
That's all I brought to you about the use of tongue nails.