If you’re 14 to 16 you must bring a parent or guardian. Also, piercings below the neck and on tongues at this age are carried out at the discretion of the piercer. … Tongue piercing is usually perfectly safe but there are some possible risks to teeth and overall health, including chipped teeth or infections.
Similarly, why you shouldn’t get a tongue piercing?
The American Dental Association recommends against tongue piercing. It shouldn’t come as a surprise, but the ADA recommends against tongue piercing because of risks including “swelling, bleeding, infection, chipped or damaged teeth, gingivial recession, lacerations/scarring, hypersalivation, etc.”