There are mechanisms where fluoride goes directly from the mouth onto the surface of the teeth. There are also mechanisms where fluoride goes from the bloodstream into teeth.
The fluoride that goes directly from the mouth to the surface of the teeth seems clearly good for caries prevention at low side effects.
When it comes to the fluoride that goes through the stomach and blood supply, it’s unclear to me whether that provides a benefit for caries prevention when you already have sufficient fluoride through toothpaste in the mouth. The side effects also seem unclear to me.
There are mechanisms where fluoride goes directly from the mouth onto the surface of the teeth. There are also mechanisms where fluoride goes from the bloodstream into teeth.
The fluoride that goes directly from the mouth to the surface of the teeth seems clearly good for caries prevention at low side effects.
When it comes to the fluoride that goes through the stomach and blood supply, it’s unclear to me whether that provides a benefit for caries prevention when you already have sufficient fluoride through toothpaste in the mouth. The side effects also seem unclear to me.