I have teeth protrusion. Dentists advised me to remove teeth. Is any method available to align my teeth without extracting any?

I have upper (more) and lower (less) teeth protrusion. I have gaps in between teeth and no crowding. I am 29. A dentist prescribed me to go for self-ligating metal braces. The dentist advised me to have first premolar teeth extraction (4 teeth-above 2 and below 2) before putting braces. As these teeth are permanent, I worry about the after effects of removal of these good teeth. Is any other method available to align my teeth without extracting any? Please, advise. Thank you, -C.Divyapriya

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