Just as mentioned with apples, water helps to speed up your mouths production of saliva which is a natural way to rid your teeth of excess plaque and tartar that causes your teeth to yellow. (letsgothin.com)
Fennel seeds contain flavonoids which activate the production of saliva. (selfcarer.com)
Drooling Teething causes an increase in the production of saliva for most babies. (teethfever.com)