Parker (7 months) just got five teeth in two weeks (yes, it's been rough over here) and we brushed his teeth for the first time tonight after we brushed his older brother's teeth (who also thought it was cool that little brother now has TEETH!).
Tips: Get a toothbrush that is fun. Let them play with their toothbrush (get a second one if you want) so that they're not "scared" of it. And be consistent.
I should add that my MIL is a dental hygenist.
