I went to the dentist last sept and had 2 extractions the feeling never came back in my bottom lip can i sue?

Last september 2009 i had 2 extractions, i always get teeth pulled so no big deal right ? wrong! as the day progressed i noticed that the Novocaine was lasting a bit longer than usual in certain areas. at first i thought this is great, no pain because i'm a huge baby about pain! then the next day comes and i still can't feel my bottom lip and gum so i called the dentist and the told me it was normal and that the feeling should come back soon, i said ok and tried to go on about my day but it felt weird you know, so I called my mom, I told her the situation and she said go back the next day and in the mean time she'd call her dentist to see if this was normal, so i go to the dentist, they check me out, re looked at x rays and so forth, only to come back to me saying the same thing.....this is normal in some cases and that the feeling would come back soon, months went by, and in between i'd go back for more appointments cleanings, consults for falsies, until my mom finally got back to me and said her dentist and people she consulted with said this is no way near normal so i stopped going there and decided to look for a new dentist but in between then and now i lost my insurance or the way i was able to use it rather and now i'm just feeling less in my lower lip and gum, now who would i see to sue them, how much do i ask for, and more importantly will i ever get feeling back in my mouth???