I want to get my teeth looking good before my sisters wedding and I need to know something that I could do at home instead of spending the money at the dentist? Thanks

This may be a little long, but PLEASE bare with me.

There is another girl in my grade whom I like intensely, and no not just on a physical level.
I’m going to start out telling you about myself, and her physically and mentally. I do this because I want your answers to be as accurate as possible so please read them.

Me:
Up until the 7th grade I was chubby (baby fat) so I kind of had self-esteem issues. I started losing my weight very rapidly after 7th grade. I currently have a slim, and slightly muscular build, somewhat broad shoulders, short brown hair, light blue eyes, clear skin (the rare mild breakout), braces (both of us have them), and take very good care of myself (brushes teeth, trims nail, keeps hair neat/trimmed. etc) I don‘t think I look too bad (now, that is).
I have usually worn baggy clothes (now wearing slim jeans and medium t-shirts. ). I’m told that I’m a genius I don’t really agree with that, but whatever. I haven’t really talked much up until 9th-10th grade. I’m kind of a laid back “geek” forget all that negative stereotype crap, I broke the mold. I’m athletic but I don’t really apply myself.

Her:
She has always been skinny. Quite pretty in my opinion, blue eyes, white teeth, nice clothes, medium-long brownish blonde hair, clear face, braces. She’s not really that dumb, some people think so, but she isn’t, she just acts that way. She’s athletic, and full of energy, she talks to everyone, and is funny. I’ve been in everyone of her classes since the 8th grade but now I only have 5/8 classes with her, and only 1 that we sit pretty close together in.

I’ve know her since the 4th grade, and I’m currently in the 10th. I’ve always liked her, but I’ve recently really started liking her. She seems to cheer me up no matter how “down” I am, even if she doesn’t say anything to me, just her being near me cheers me up considerably.
We have a quite a bit in common despite what I previously said. We have had some fun times, not many but a few.

We kind of hang out, she seems to be around me more this year than last year, she actually walks up to me and talks to me before school starts, and occasionally comes up to me at lunch.
Going from class to class we usually walk together and talk about random things, during this time I usually complement her or attempt to (not really good with the talking thing. ) she usually says “Aww, thanks” in the typical voice.

She teases me often, usually with “I’m glad your not in all of my classes this year I might actually get an award. ” I usually say “Gee, thanks… you make me feel wanted. ”.

She makes eye contact with me in the class we sit close together in and smiles and then looks away. In the same class she often makes comments towards me which make me laugh.

And she hits me. Not bad, the play full hit.

I try flirting with her, but I don’t really know how flirting works or better yet what to say other than “You’re looking very nice today. ”

Anyway I’m not the best at explaining things, I suppose I could say I have a feeling she sort of likes me but I don’t know for sure. If it’s blatantly obvious to you please enlighten me I’d love to have you opinion on the matter, and if you have any tips on how I could pursue this feel free to tell me.

One final thing I‘d appreciate it if you kept the negative comments to yourself please.

Thank you everyone who read this, and thanks ahead of time for responding.