Will getting a mouth piercing when you are 14 years old hurt?

Any piercing hurts to some extent and being 14 doesn't give you superpowers to be immune to the pain of any piercing let alone an oral piercing. In body piercing you need to learn that if you want the piercing you will get it regardless of any discomfort you may feel. Bottom line if you want the piercing you need to be prepared to go through the piercing the swelling and the aftercare to heal the piercing. If you feel that is too much for you to deal, with then find something else to do, but don't get a piercing. It takes commitment and effort to have a great piercing, if you really want it then a little discomfort and swelling shouldn't be an issue.