Help with dental care please?!

Okay, I know they are not cavities, but I have one tiny grain of sand size hole in one of my front area teeth and another as well a little bit larger, (one on top and one on bottom). They do not hurt when I brush on or around them, drinking hot or cold doesn't bother them, and I've had them for almost a year now and they haven't gotten larger, at least that I can notice. I have read about dental bonding procedures and such to rebuild or cover enamel, any advice or thoughts? I brush twice to three times a day and use ACT mouthwash and floss, so I don't know why they are like this. I am 24 and have had no cavities.