There are few things that show as an immediate cause and effect as not caring for your teeth and decay .
Dental care is VERY expensive.
Don't brush and floss your teeth, and decay will set it. It's that simple. In most cases, it's an unnecessary expense. My son Eric climbed Mt. McKinley a few years ago. He made it to the summit, which was great, but it also took him almost a month, during which time he neglected his teeth.