Till what age do the permanent teeth erupt?

Q: My teeth grew on time when I was an infant but they fell beyond the schedule. Now re-growth has taken place except for one tooth. I am 9 years plus now and this one tooth has not come out yet. What is the reason and way out?

A:The permanent teeth erupt till the age of 12. Normally there should be no reason for worry. Still it is best that you get an X-ray done and consult a Dentist.