My daughter just turned two. I am a dental hygienist and my Mom keeps her while I work, so we make sure her teeth get brushed 3 times a day. Recently when brushing her teeth, I noticed a small whole in an upper baby molar. It is a little sticky and is definitely the start of a cavity. I am putting fl2 on it every 2 weeks at bedtime. I also ordered her some of the xylitol gum and sweetner for drinks. Is there anything else that I should be doing? The cavity is about 1-2mm deep.