Hello,
As for me XyliMelts did not work. In fact they made my mouth feel gummy like so I stopped using them.
But, if they work for your family member then great!
I live near a dental hygienist school which is where I purchased my XyliMelts at a very fair price if that’s an option for you?

I personally found the hot water rinses along with sipping and hacking first thing in the morning and several times throughout the day and even through the night at times works best for me. I follow that up with brushing with toothpaste and also with prescription fluoride toothpaste ($20.00) as well. I also pay for fluoride treatments every 6 months during my dental cleaning and check up.

The dry mouth is a very annoying situation. I carry a bottle of water when I’m out and about as well. Talking is a huge dryness onset for me.

Your family member will most likely experience difficulties in swallowing food as well.
What works for me is water, lots of water to wash down every small bite…been doing all of the above for nearly 7 years!
Oh and BTW, speech therapy did nothing for me except cost money!

Hope this helps,
MOJO