Hello and welcome to ‘Ask A Doctor’ service. I have gone through your query and understand your concerns. As per your complain it looks like dry mouth along with dry tongue with tongue sticking to the teeth is due to a condition known as dry mouth or Xerostomia. Common causes for Xerostomia can be: - 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 Bitter taste is due to reduced saliva flow only as the saliva maintains taste buds and in the absence of appropriate quantities of saliva there is alteration in the function of taste buds leading to altered taste. For dry mouth chew sugar free chewing gums, drink plenty of water, avoid regular mouthwash and use specialized mouthwash that are formulated for dry mouth patients like Biotene. You can also instill artificial saliva drops, and suck tart candies as it also stimulates saliva flow. If it 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