9 month old cutting teeth

Sarina💋 • I'm 25 • FTM • I gave birth 3 weeks early to an amazing little boy named Cameron • 10/6/15 • 7lbs 8oz • 20in
This is probably a silly question but how soon after your baby starts cutting teeth do you take them to see the dentist? When I asked my sons doctor he looked at me like I had six heads and that it was the dumbest question he's heard all day lol. I'm a FTM and I don't know about these things lol please help thanks.