Hey Michelle!
I have also heard that the later they come in, the healthier or stronger they are! I am not sure how true that is, but I myself didn't get teeth until I was a year old, and have never had a cavity. My brother, on the other hand, got teeth at 6 months, and always has problems! It seems like he is always at the dentist! Same goes with my son....he didn't get any teeth until he was 14 months old!! It didn't stop him from eating either!! He loves food!! His cousin started getting teeth at 5 months, is now 3, and has already had a cavity.
I am also not sure about the talking thing. But my sons first word was ,"Hey Sadie" that's our dog...and he started talking at nine months. Then he started saying Hun GEE!! for hungry. Anyway, his cousin...and he is older...didn't start talking until a year...and still doesn't talk as well as my son. But, I don't know if that has anything to do with teeth.
He will be fine. There isn't a set timeline saying when children should expect teeth...or what is normal. Hope this helps. B.