What can I do if my tongue is feeling very bitter while fasting?

During the detox, you may notice a white coating develop on your tongue. This may be the source of the bitterness you are experiencing. 

It is perfectly normal to experience this as the body may be using your mouth as an elimination channel to drive out the toxins from your body, which leads to the white coating on your tongue. You can simply use a tongue cleaner tool to get rid of this white coating.