Trigeminal neuropathy is usually a compressive disorder.
So most of the treatments are to locate and remove the compression.

However it is a long complex nerve with many branches, and like other nerves, may react to other environmental insults.

If other symptoms are present in other nerves, then that would be a hint that something more global were going on. If only confined to the face then the trigger is most likely in the head/neck somewhere.

There are healing things/supplements you can try.
Fish oil or Krill oil, helps nerves. And lipoic acid can help.
It also depends on whether you had blood work done on B12 and Vit D to see if you need those. Labs in US are typically low in range, so if you are below 400, you could take a oral methylB12 daily and see if that helps.