My girlfriend is thinking about getting a piercing and I don't want her to.
Is it because you think it's dangerous?
I believe piercing could lead to nerve damage and I don't want my gf to be hurt.
Your fear is totally understandable. I guess your gf must have decided to get a piercing after thinking about it thoroughly so you better support her decision rather deciding what's good for her body.
Have you seen those ugly gross piercings she has right now? Those are so dangerous.
You shouldn't call your partner ugly, or if you find someone ugly enough to call them gross, you shouldn't be with them. The piercings she has haven't hurt her, so maybe you should research how safe piercings can be. Do you love her more than you dislike piercings?