I know a person who grew up on a farm in Italy and ate only clean organic food for the first 18 years of her life.YHWH did not command His people to not shave their legs. Brushing one's teeth is a matter of cleanliness.
She never brushed her teeth and she never had a cavity.
It was only when she came to America and ate garbage food did she have to brush her teeth.
And yes, then she got cavities.
I guess this is just another social issue.