Hi.. Thanks for the query.. It looks like the thick discharge can be pus if the gums are infection.. In case if you are being diagnosed with dry mouth then there is a possibility that the watery content of saliva is reduced leading to thick mucous like saliva.. So my suggestion is to once get a thorough scaling done and do gum paint massage to reduce infection.. You should also manage the dry mouth as you are already diagnosed with it.. You can start chewing sugarfree chewing gum, suck lemon drops and gargle with specialised mouthwash like Biotene.. Drink plenty of water.. Hope this helps.. Regards..