I have residual tooth roots untreated for years, i'm waiting to get them removed in few days.i'm having bad pain that goes to my throat and my blood pressure went high because of that. it is a safe surgery?am i in danger with this pain and infection?

You've got untreated, infected residual roots. Surgery is safe, but are you on antibiotics for the infection? You are under the care of a dentist, have them manage your pain and infection.

Risk of damage to other organ systems (brain, heart, kidneys, etc.), and even your life, from the foci of infection is much, much greater than the surgical procedure itself.