Making the decision to get braces for the second time.

I have gotten braces once before and now am interest in getting braces again. The first time I got braces I was on medacaid. I felt as if my old orthdontist rushed my treatment because when the braces came off after a year and a half I still had a over bite and my teeth still protruded some to where it made me appear to have large teeth. Before my teeth were severely crooked and when the braces came off my teeth were straight but the alignment of my bottom and top teeth were off and when I smile big you can tell. It has been two years now and now have made the decision to get braces once again because I had lost my retainer and when I finally got an appointment to see my orthodontist my teeth had shifted. I am going to go through a different orthodontist to recieve braces again. This orthodontist told me that I would have to have four teeth pulled before treatment and that the roots of my teeth are short and that I would have to get x rays each month to make sure that the shortening of my roots isn't due to braces. I also have a severe receding gum line and the teeth with the worst of the receding gum line are the one getting pulled. I am very nervous to get braces again and I was wondering if because of all of my dental problems if it would be okay or only make my teeth worse?