K.K.
I have worked in a dental office for 12 years as a dental assistant, and have three children of my own. My advice is to let your child brush her teeth on her own first, while you watch. Then you tell her you are going to look and see if she missed any spots. Then you can go in brush again, making sure everything is clean. I recommend an electric toothbrush, because a 2 year old doesn't have the dexterity to manipulate a toothbrush in a way that will effectively clean her teeth. Find one with a small single head, Like an Oral B. You can also get them with build in timers which helps, because kids often don't brush long enough. They should brush for 2 minuites, 2 to 3 times a day. Personally I would use a toothpaste with Fluoride. I'm not sure if the water in Powder Springs has Fluoride in it or not, but even if it does it would be a very, very, small amount. Fluoride offers significant cavity protection, and as long as you use a small amount of toothpaste (the size of a pea) you shouldn't worry. If you are concerned about Fluorosis ( a condition caused from too much Fluoride that effects the appearance of tooth enamel) contact your dentist for more advice.
Hope this helps :)
K. K