How do I get my mom to take me to the dentist?

Update: I'm 15, so no I can't go on my own. It's been about 7 years, I'm surprised my teeth haven't fallen out.
Update 2: I've tried talking to her. She likes to say she'll do something a billion times before she actually does it.
Update 3: Oh, and did I mention that anytime I try to tell her about herself, she gets violent? Calling CPS is not an option and I have nowhere else to go. I'm stuck, and I'm miserable.
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