Well, you need to decide if it's real hunger or just a craving for food. If you think it's real hunger, maybe it's time to quit. If it's just craving, well... reflect on your relationship with food...
As far as the tongue is concerned, having a white tongue is not an indicator of whether the cleanse is done or not. Many people go for very long fasts (+/- 40 days) and never have thier tongue turn pink. It will most likely turn pink when you get back to a healthy normal diet.