Oh, over-night. Best not go to sleep sucking a sherbert lemon! lol I don't know of anything that would work over-night. But, in the evening, I always have a glass of lime cordial in water, and that helps enormously.
I’ve had trouble with ulcers/ dry mouth and an aromatherapist recommended ‘pulling’ with organic coconut oil.This really helped me and I use periodically if I have any recurring issues with oral health.
I get dry mouth. If I wake up with a dry mouth I sit up for five minutes and it resolves but of course if you have to get up in the morning that's not so helpful.I've never been able to find the underlying cause.
I think they can all be bought without prescription. As to whether they include artificial sweeteners, I don't know, you'll have to check before buying.
Maybe bubble gum instead of chewing gum? Here's an example that doesn't have artificial sweeteners, just old fashioned sugar! There may be others amazon.co.uk/Wrigleys-Hubba...
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