"Systemic fluorides can also give topical protection because ingested fluoride is present in saliva, which continually bathes the teeth providing a reservoir of fluoride that can be incorporated into the tooth surface to prevent decay."
It also says fluoride ingested during teeth-formation is incorporated into the teeth.
"Systemic fluorides can also give topical protection because ingested fluoride is present in saliva, which continually bathes the teeth providing a reservoir of fluoride that can be incorporated into the tooth surface to prevent decay."
It also says fluoride ingested during teeth-formation is incorporated into the teeth.