TTC #1: Dental check ups

My hubby and I are TTC #1 and this is the first month we are really actively trying. I have read the "TTC Checklist" on Baby Center and one of the first things I saw was getting your teeth cleaned. How many women have done this and think this was significant to them A) not having a misscairage B) getting pregnant at all? Also is it necessary for my prenatal to have Omega-3 in them? Or am I ok getting it from eggs. Thank you for any advice and input!