I have to have a tooth extracted because it is diseased. It is the same tooth directly on the other side. I'm not sure how the trigeminal nerve runs. Am I more suseptible or LIKELY to get it again??? I have felt twinges of it on the other side before on the lower side and thought I had bilateral, but I'm not sure.
Someone who knows please answer, because I am so worried.
Thank you,
LoveLex
Hello 
Sorry to hear you have to have a tooth out. You’re very brave even going to the Dentist! I won’t go.
I can only speak from my own experience, but if I have to go to the dentist, anything he does, be it a cleaning, a filling, will set my TN off, even if the tooth is on the opposite side of my face then what I currently/normally suffer with.
I do suffer with TN in both sides, although for the past year it’s only been in the left, I need to have a tooth pulled on the right side but I won’t go because I’m that scared of it setting my TN off.
You may be very lucky, and have the tooth treated and be fine, or you might not.
I’d say prepare for the worst but expect the best.
Again, this is only my experience as someone who has TN on both sides of my face. 
I would think that if you only had TN one side and not the other, and the tooth was on the side that didn’t have it, you should be fine as the nerve branch is completely separate. 
(you have two trigrminal nerves, one in each side of the face.)
I wish you the best of the luck, and I’m sending positive thoughts your way.