T.R.
It varies from child to child.
My oldest didn't have a tooth in his head until he was almost 10 months old lol. My youngest got his first tooth when he was 6 months old. My best friends little boy got his first tooth when he was only 4 months old!
So there is no certain age that a child starts teething.
I honestly thought my oldest son would have gotten his first tooth early, because by the time he was 3 months old, he was chewing anything and everything he could get his hands on, and I had to keep a bib on him because he drooled really bad! We would go through at least 6 bibs per day! But like I said, I was still getting big, toothless smiles from him until he was almost 10 months old.