How Often Should I Brush My Golden Retrievers Teeth?

It really depends.. If he gives you a hard time about it then once a week but if not why not do it every day nothings better than white teeth.. If he does give you a hard time there are special bones to clean teet.. It really works my dog has them!!

Daily or at least every other day

You don't HAVE to brush them everyday.
Just when ever you get time but yeah probably at least once a week.
If they have hard dog food, that's what cleans there teeth.
But there is doggy tooth paste, if you use a human kind of tooth paste, it could upset their stomach.
But if you want their breath to smell better you can use human,, just make sure you have clean cold water for them to drink afterwards. To wash it down and not upset their belly.

I dont brush my Golden Retrievers Teeth, and they seem fine, but i am tempted too after reading your comments, Thanks!