DD has bad teeth! Ok, I admit that when she first had a cavity we probably didn't brush her teeth as well as we could (though much more often than other people I know)!!! Since then we have made sure to brush her teeth for her (until she turned 7 ish), we got an electric toothbrush and have 6 month check ups on the dot!! Our last check was around 4-5 months ago and she got a clean and fluride treatment and they said her teeth were fine. Well she has just told me she has a hole in her tooth and on inspection sure enough she does! I don't understand what we are doing wrong? Her younger sister has had no cavities as of yet! How can she have had no signs of cavity 4-5 months ago and now all of a sudden she has a visible hole on the edge of her tooth?