Most people recognize that cavity problems seem to run in families. Most people also shrug and say "I have soft teeth, it runs in the family," as if they cannot do anything about it. That is wrong. Research has never demonstrated soft teeth. Research has definitely demonstrated the bacteria that cause cavities are contagious and we usually get ours from our caretakers when we are infants and first growing teeth.
If a family has aggressive cavity causing bacteria, they are typically traded to the infant at those cuddly slobbery spoon sharing times. But, please do not stop being cuddling nurturing parents. There is another way! The contagious disease is dose dependent. Research has shown that cleaning up mom and dad's oral health before baby is born, or at least before infant teeth show up, is an excellent way to reduce bacterial count and improve outcomes for baby. By the way, this includes improving odds for full-term pregnancy.
A good way to start would be a dental checkup. However, by "cleaning up oral health" I don't mean necessarily getting those expensive cavities filled, though that obviously helps too. Immediate and inexpensive, or even free things people can do are:
1. Become a truly effective tooth brusher.
Use disclosing tools (tablets, solutions, or kitchen food color) to show you the bacteria. Then teach yourself how to thoroughly clean your teeth. Check yourself every couple weeks until you are confident you have figured it out. Most people find they can thoroughly clean their teeth in about half the time they used to.