Dear friend.
Thanks for sharing your concern.
First of all i would like to explain you that the nerves of the teeth are not interconnected to any other organ like eye brain etc..extraction would not affect these organs for sure.
Every small part in our body has its own muscle and nerve supply,which does specific function related to that organ.
Now coming to your
dentist advise,i think there is some misunderstanding regarding teeth extraction.
He or she would have said that, you require four teeth extraction as there is no space in the jaw to move the proclined teeth.
Secondly remember it is premolars(back teeth)which is usually extracted never the front teeth.
Here the best suggestion that i can give you is please revisit our dentist and understand complete treatment procedure before taking any decision in haste.
Extraction is required,for how many teeth, can be decided only upon taking an
x ray called cephalogram,And IOPA x rays.
Hope i have answered your query.
for further query please let me know.
Thanks.
Take care.