This butter oil cured my daughter of cavities. She's had lots of rapidly progressing cavities since age 3. We began butter oil over a year ago and she hasn't had a single cavity since. This is it. Weston Price was spot on.....vitamin k2 from rich food sources such as butter oil is the missing link to those prone to cavities. It's stored in animal fat and our diets have it in very slight amounts as cows aren't pasture-fed anymore and people rarely eat animal organs, etc. This also completely reversed a couple of minor cavities I was developing. One bottle lasts my daughter and I about 3 months. We put it on toast, 4-5x a week. Awesome stuff!!!!!