Even a stone can flush out after enough days. Eating sour candy helps if you are at home, and sweet tarts or lemon drops are good :) That and drinking water to make sure you are hydrated can help but dont hurt it.
Its actually amazing how dehydrated people are. Keep in mind drinking coffee everyday, having a few alcoholic drinks now and then at night, drinking soda at lunch (caffeine) and not drinking much water really starts to add up to dehydration. Anytime I eat lunch I always try to drink caffeine free soda so I'm not adding caffeine all the time to my day.