I was diagnosed with Parkinsons about 8 years ago. I have recently started having a dry mouth resulting from a lack of saliva. This has caused me to have a very sore tongue, amongst other things. As this is a recent problem, I wonder if it is due to an addition to my medication. I have been prescribed an artificial saliva which does help for a short time. I have a number of problems beside Parkinsons so take additional meds, but if it is one of my meds, I have not been able to track the culprit down so far.