Should I get braces now, or have fake teeth later in life?

On the bottom of my mouth I have a tooth on both sides that don't have adult teeth under them. So I'll eventually lose them. I could lose them when I'm about forty and have fake teeth, or I could get the bottom teeth removed and the top adult teeth that are in the same spot removed and then get braces and not have to deal with getting fake teeth. The problem with the first is I don't want to have to get fake teeth. Problem with the second is my teeth are perfectly straight except for one(which is hardly noticeable), but I have a small mouth so when i get my wisdom teeth I might have space problems... So I'm leaning towards getting braces, but which should I do?