https://www.amazon.com/Orahealth-XyliMelts-Mint-Free-Discs-discs/dp/B00JY1GBMC/ref=mp_s_a_1_4?crid=19CXWK93K4SSK&keywords=xylimelts&qid=1654709587&sprefix=xyli%2Caps%2C107&sr=8-4

I don’t know if these will work with a night guard in. But these fixed my nightly dry mouth issues that I got from gerd. Hope this helps!