My mouth often gets chapped. Can I use high-fluoride toothpaste?

My mouth is often sore and my mucous membrane is a bit weak. I am currently using low-fluoride toothpaste, but even though I brush my teeth well, tartar still forms and I am starting to see some cavities.

I'm thinking about using a high-fluoride toothpaste to prevent cavities, but could the strong ingredients further irritate wounds in my mouth or weaken the oral mucosa?

I have sensitive oral mucosa, so I'm wondering if I can use high-fluoride products.