The cranial nerve network to the face is very involved (you have twelve paired cranial nerves in your head and neck) with all of them except the IVth terminating in the cranial nerve nuclei. The nuclei is basically half motor nerves, half sensory, damage or signal interruption in any nerve will usually be interpreted in the brain as pain (neuropathy). Because the nerves terminate so closely together there is a lot of "cross talk" so when you are feeling pain in an area of the mouth, like tooth pain, it's the reason why you're whole head feels painful and hot.

Nerve pain isn't easily treated and Trigeminal Neuropathy or TN is considered the most painful condition known to man (The Trigeminal Nerve is the Vth Cranial Nerve or CN5). Treatment options aren't usually good if anti-seizure medications or low dose tricyclics (anti-depressants) don't work. Direct injections of local anesthetics are used to provide some relief or biofeedback, accupuncture etc.

Lasering of the nerves would be the last option and the side effects would depend on whether the nerve causing the issue is a motor nerve or sensory. My VIIth cranial nerve (motor) was damaged during my mandiblectomy due to tumor placement, leaving the entire right side of my face paralyzed. 18months after that surgery I had a CNVII-CNXII nerve graft done to try and restore motor function to my face. Basically they yarded out the nerve that controls half my tongue (CNXII) and grafted it into my facial nerve. Didn't work but it was worth a try.

Anyway, the pain needs to be identified as to whether or not it is in fact neuropathy or just pain caused by the treatment etc. If it's a damaged nerve then they can start doing tests to identify which nerve and where the issue is by hooking up electrodes and sending a signal through your face. It's not bad really, I've done it. Don't let any of this freak you out, the main thing is to treat the pain and then find the answer to what's causing it and THEN worry about the solution. One step at a time.

Let me know if I can help in any way, sadly I know too much about the issue.

Eric