I've been using it on my babies for a couple of weeks now and I already see results! Especially on my Stedman, since his teeth are way worse than Tatum's. You can use a soft toothbrush or finger brush if you want, but I personally just put a little on the end of my finger and rub it on both sides of their mouth (well, teeth) and a little on the front of their teeth as well. That's it! It's that simple
One thing to remember though is that they are not supposed to eat OR drink anything 30 minutes before you use it on them, and 30 minutes after.