Childrens dental care now-a-days... causeing poor tooth health?

Some kids just have really resilient bacteria in their mouths. All you can do is take them to the dentist every 6 months, like clockwork, and brush at least 2x day and floss 1x day. Sounds like you're doing everything else you should be. It's not like the dentist is causing your kid to have cavities, some just luck out in the teeth department.