I know that there are others on here who struggle with Sjogrens (eg very dry mouth and eyes) secondary to RA so thought this info might be useful. Apart from using Biotene dry mouth toothpaste and mouthwash, I rely heavily on my dry mouth spray at night and for when I am out and about. The one I have been using from Boots has now been discontinued and I was getting a bit desperate because I couldn't find an alternative and the one prescribed by the GP is not very good and has a reputation for being very acid and potentially causing tooth erosion - already a problem if you have a permanently dry mouth. But today, my husband discovered that Boots Expert Dry Mouth Mouthwash is, in fact, exactly the same as the discontinued spray and is still available. One bottle of the mouthwash will fill about 10 of the spray bottles so the cost is hugely reduced too. So off to Boots tomorrow to stock up.
Anyhoo, hope this info is useful.