A.M.
Hi Debbie,
My daughter is from China and tooth decay is genetically notorious there.
Our pediatric dentist put my daughter on fluoride treatments, to build up her enamel. She takes one small pill every other day.
She doesn't have a cavity in her month. Of course there are lots of people who don't believe in fluoride, but in our case her teeth were really susceptible to decay, and we had to weigh the risk. My husband is a prof. of medicine at UCLA and we did a lot of research on the pros and cons. We decided to go with the recommendation of our dentist.
Just a thought.
A.