Should I listen to the dentist and extract 4 teeth in the back? (Photo)

I have worn retainers in the past and I have been to 3 different dentists -they can't explain why the roots in the back won't stop reabsorbing. But I do believe that there was pressure and barely any room for my wisdom teeth. I would like to know if I can stop it , as well as if there's any hope that I can save them. And any further opinions... i

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