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How to convince your parents to let you pierce your nose
Be sure about your decision.
If you're going to convince your parents that you're ready for a piercing, you have to show them you're mature. Mature people don't back out of their decisions because they get bored with them.
A piercing, especially a cartilage piercing, is a long-term commitment that requires daily maintenance. Make sure that you're informed about the entire process in advance.