Hi there! I've been a dental hygienist for several years now and I don't know if you've already gone to the dentist or what has happened since you posted this...What we learned via textbook is that a child should see a dentist 6 months after they get their first tooth. In my experience however, the best visits were based on "emotional readiness." Some kids were ready at 2 years old, some not until they were 3 or 4. I never worked in a pediatric dental office so I never saw anyone younger than that, but even at 2 years old, if they're a little shy or timid about life it might be a better idea to wait, unless you see something inside their mouth or on their teeth that doesn't look right to you. Furthermore, have them watch an older sibling or parent who loves the dentist so they can see what it's all about and gain positive experiences before they even get started. You probably know that you should be brushing your sons teeth 2x a day, morning and evening are best, not put him to bed with a bottle, and at 1 years old check and see if there is fluoride in your water or see whether or not you'll need to give him fluoride drops.
Hope that helps a little.
L.