There has been an ongoing debate whether toothpastes should contain fluoride or not. Fluoride has been proven to help remineralize your teeth, and together with calcium and phosphate, they create a powerful defense system that prevents cavities from forming. On the other hand, there have been reported cases of poisoning from ingesting excessive fluoride - more than 80% are children 6 years old and below. But whether you choose to use zero waste toothpaste with or without fluoride is totally up to you.  You can also consult a dental care professional for advice.