i have heard oral health can be linked to women's fertility:
but haven't heard it about men
Yes, it can for women, and it wouldn't surprise me if the same held true at least a little bit for men. It isn't an instant fix for women, and it would be even less instant for men. Since the sperm used today began the process 72-90 prior to today, you are looking at a minimum of 3 months before work done on a man today would have any effect.