Hi..
Welcome to HEALTHCARE MAGIC.
I have gone through your query and can understand your concerns..
As per your complain it seems that you are suffering from a condition known as Xerostomia that is causing dry mouth and can be due to a number of conditions like
salivary gland disorders,
mouth breathing, nerve damage, oral infections like Thrush, side effect of certain medications, hormonal imbalances etc..
On the other hand dry mouth can be a cause for thrush that is causing white coating over the tongue and seems to be a cause in your case..
I would suggest you to consult an Oral Physician and get evaluated and in case of Thrush he can advise you to take antifungal medications like Nystatin mouthwash and
clotrimazole lozenges..
For dry mouth you can start chewing sugarfree chewing gums and suck tart candies..
You can gargle with specialized mouthwash formulated for dry mouth like Biotene..
Drink plenty of water..
Maintain a good
oral hygiene..
In case if the thrush does not resolve in 15 days oral antifungals like Fluconazole,
Itraconazole can be advised..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora..