Biotene and Oasis are also products you can try that are artificial salivas.
It would also be a good idea to get some prescription toothpaste from your dentist, Prevident 5000 is the most common.
Depending on the severity, xylitol gum can help by stimulating saliva flow and decreasing bacteria content.
Why don't you try Salivart.....it's is an artificial saliva.....adds moisture to the mouth & is
over the counter.
orodental management of xerostomia includes topical fluoride,frequent sipping of water,local stimulation with cewing gums or mints, systemic stimulation with medications ,for example, pilocarpine hcl. Detailed consultation with an oral medicine specialist is advised.