I just had my second dental for Ricky and he is 2 1/2 years old. I don't know if you would consider his first dental a "real" cleaning as he had to get his baby teeth removed, and that was done at 1.5 years old. When he was at the vet last to get his anal glands done, the vet said she thought he needed his teeth cleaned. I don't think they looked that bad, but we got them done anyways.
I have no idea if doing them at that early of an age is standard, but my 10 year(Prince) old just lost most of his teeth and I don't want it to happen to my little guy. Since Prince had his teeth out, I actually had a dream that he's had a full set of pearly whites on top...in my dream I was surprised because I thought they were all gone and come to find out, I just didn't see them.
Of course, in reality, he has no teeth up there...but I've felt so bad about him loosing them, it's actually caused me to dream about it