Will tooth extractions be recommended for crowding, severe overbite and retrusion of the lower jaw?

I went and visited a dentist and he said he will put braces on for me. He said that first I will need to use a palatal expander on my upper jaw and then have four tooth extractions. Due to me having class II malocclusion and a returned jaw, I am scared to pull out teeth. Will pulling out my premolars affect my face and will it cause TMJ?

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