From my experience on when is the time babies starts teething, there is no specific date or month that it's supposed to happen. Every baby have his or her own day to start teething and a lot of things are directly impacting on whether it's going to be earlier or late within one year. I have actually seen some babies that are well above 1 year old but are still yet to start teething. What the baby eats well goes a long way in determining when such baby would grow his or her first milk tooth.
My little niece is 11 months old right now but she is yet to start teething but there was a time during her 5 months of age when her gun was itching her very much. She was teething powder to help her stop the itching and we were all looking forward to seeing her tooth but till now, it's yet to grow.