@Natsu:
Do you know what I did since my son was only 1? I brought him along to my own dental check-up.
I would get on the weird chair, open my mouth, dentist would look around.
Then it was his turn.
First time he did not want to open the mouth xD
But then he did, and nothing bad happened, and he could walk around the room seeing all kind of strange fascinating stuff the dentist used - just not on him.
But the age of 3 he was not impressed anymore, and he was quite calm when we had to make those fillings. He just wanted mommy to hold his hands, that was all.
But it had been his first visit, he would have been more scared for sure.
On the other hand my brother inherited our mom's teeth, and he never even cared to wash them properly
Damn bad luck of mine.