Dry mouth is a listed and common symptom of PD, but I think when many PWPs go to see their doctor, it may not be their highest priority to talk to their doctor about it with the other PD symptoms possibly being more prominent in the patients mind.
Another consideration is that dry mouth is likely more common as we age. Another issue is that some medications are well known for causing dry mouth.
I get dry mouth at times and have had it bad enough where my tongue felt like it was glued to the roof of my mouth! That was a shocker to wake up and I could not move my tongue!
Dry mouth can also be a common symptom of Sjogren's Syndrome among other health issues that can also cause dry mouth.
Dry mouth can also contribute to tooth decay which is only going to make things worse in terms of overall health and total inflammatory load.
What I have found is that a very simple mix I make at home seems to help alleviate my dry mouth temporarily. I make a combination of xylitol, vegetable glycerine, distilled water and spearmint essential oil. I mix the granular xylitol at approximately 5% to 10% with approximately 5% to 10% vegetable glycerine. I add these two to the distilled water and then drops of spearmint essential oil to the mix to taste. Sometimes I use peppermint essential oil or both spearmint and peppermint oils. I shake this mix and then I fill a two ounce spray bottle with it and leave it on my nightstand, so on those rare occasions when my mouth gets dry at night, I reach over and put two sprays in my mouth and the dry mouth is controlled and refreshed by the essential oil. I try not to use more than two pumps because that is just enough to work and then I usually don't swallow any. When my dry mouth condition used to be worse and was noticeable during my waking hours, I used to carry another two ounce spray bottle in my pocket and spray as needed. Another advantage to this mix is that the xylitol can act to kill some bacteria as well as some biofilms as can the essential oils. Another benefit is that the combination of xylitol and vegetable glycerine has anti-irritant qualities as outlined in studies. This mix has other uses, but this is what I mainly use it for. I always use food grade vegetable glycerine and xylitol, the common sugar substitute, is already intended for internal consumption. A good quality essential oil is required.