Hi ~ Alot depends on the dosage you're on. If you're on too small a dose, it might not ever help. But I took neurontin and I noticed it SLIGHT improvement after 2 weeks. I hated that it took so long to work cause I was in agony. The thing I hated about it is that it made me "loopy" and i gained water weight. My doc took me off it after awhile, and we went to topamax, which is a similar drug, as it doesn't make you retain water, you lose weight on it, and you don't feel "loopy." lol. I'm still on it after 9 years, and it works great!
You mention Lyrica causes tooth decay??? Good grief! I just had MAJOR dental work done due to decay caused by opiates ~ I sure don't need this. Arrgggghhh!

What next.
Take care. Hugs, Lee