Hi, I have gone through your query and can understand your concerns. As per your complain it looks like sore tongue, chapped lips along with sores in mouth and tongue occurring due to extremely dry mouth can be due to causes like: Severe dehydration, Side effects of medications if you take any, Salivary gland dysfunction, Nerve damage supplying salivary glands, Oral infections like thrush, Sjogren s Syndrome. For dry mouth, chew sugar free chewing gums, drink plenty of water, avoid regular mouthwash and use specialised mouthwash that are formulated for dry mouth patients like Biotene. You can also instil artificial saliva drops, suck tart candies as it also stimulates saliva flow. You can also use Xylitol patches that you can stick in you inner cheeks and they form a coating inside mouth and will keep the mouth lubricated. For chapped lips apply thick coat of Petroleum jelly as it helps in locking moisture and you can also apply beeswax containing lipbalm. If does not improve consult an Oral Physician and get evaluated. Hope this information helps. Let me know if I can assist you further. Thanks and regards, Dr. Honey Nandwani Arora