Can I close an old molar gap with braces? (Photo)

Im 40 i had my lower molars extracted echen i was a teenager i started yo wear braces 10 months ago and now my doctor said the gap cant be closed because there is not enough gum por the teeth to move he wants a bridge ir implant and he says is extreamly dificult but i rather keep my teeth, I was sure with braces my gap could be closed can i have yogur opinion.

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