The white tongue is a sign that toxins are being removed from your body. Its normal when you are doing MC, or any other fasting or cleansing program. Its also common to get a white tongue when you are sick, your body is getting rid of toxins. If you have a white tongue all the time it is probably a wake up call to change some habits before your health breaks down. How long do you plan on going? Day 6 is over the hump for a ten day fast.
As for doing the liver flush, its another degree of cleansing. Its something I believe everyone should do, but it is optional. You are cleansing your whole body doing MC, including your liver. The gallbladder/ Liver Flush is a great way to get rid of stones and toxins still in the liver, and creating an even healthier body.