Can someone who has a Mt.Dew addiction and has had many cavities or knows about dentistry, answer some q's???

I, like many young adults and teens, have a serious addiction to Mt.Dew. I've been drinking it since 18 and am now 34. I drink now about 2-2 liters a day. I never had a cavity till 19 and went to the dentist 2X a year. I now have 38 cavities that have been filled (obviously, multiple decays in one tooth). My last visit yesterday revealed I have 12 new ones! They will have to use crowns since there is little tooth left. It will cost an estimated $9,000 and my teeth will still be severly discolored. It is so depressing. I used to have a lovely, white smile! My parents were so big on not letting us drink pop or have a lot of candy and sugar growing up and stressed brushing and flossing atleast 3X a day even at school! I'm not being vain but I am very preety but when I smile, it's a disaster! I can tell when a hot guy hits on me that he kinda changes his mind once he sees my teeth. Luckily, I have a good bf that isn't superficial. I KNOW WHAT YOU ARE THINKING! (cont'd)