Hi.. Thanks for the query.. Dry mouth or Xerostomia is not a disease in itself but it can be a symptoms of any underlying disease.. There are a number of common causes that can cause dry mouth like side effects of medication if you are taking any, salivary gland disorders, nerve damage that supply salivary gland, severe dehydration, fungal infection or thrush in mouth, hormonal disturbances etc.. So you should get checked by a Physician to rule out the cause of the dry mouth.. Once the cause will be treated you will get better.. For now you can start symptomatic treatment like chewing sugarfree chewing gum, suck lemon drops. You can start using oral lubricating gels like Oralgel and instil artificial saliva drops.. Drink plenty of water. You can also be advised medication like Pilocarpine as it helps in improving saliva flow.. Hope this helps.. Regards..