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Your parents may not reach a decision during the conversation. Maybe they need time to talk alone, or maybe they haven't yet gathered their thoughts. If this is the case, thank them for listening to you and ask them to let you know what they choose. Don't pressure them for an answer before they're ready. Even if their decision doesn't align with your wants, your parents still have authority over you. Avoid getting overly upset or lashing out at them for their decision. Be kind to them and show them that you're mature. They might be more lenient when you're older. You might feel like they're being unreasonable, but maybe they grew up in a culture where piercings are rebellious. Think about who your parents are and why they made their choice. You might just gain empathy for their decision. You might even agree with their perspective a little, if you understand it. If your ear piercings have a history of serious infections, for example, your body might not respond well to a second piercing. Until you're eighteen, your parents have guardianship over you. You can choose what piercings you have and where when you're an adult. Keep this in mind when you feel upset, and think about all the piercings you'll get someday. Until then, have fun with the piercing you already have and read up about future piercings. No doesn't always mean no forever. If your fourteen, for example, your parents might want you to wait until you're sixteen.
Give them time to decide. Accept their choice. See the situation from your parents' perspective. Wait until you're an adult.