The lip-smacking from their smooching sounded like an elderly man with dry-mouth syndrome while walking vigorously through the desert.

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Over-the-counter preparations, such as Biotene products, can be helpful for long-term dry mouth.

CNN: Overactive bladder

For example, your doctor may recommend that you suck on a piece of sugar-free candy or chew sugar-free gum to relieve dry mouth, and use eyedrops to keep your eyes moist.

CNN: Overactive bladder

Its lead product - LMS-611 - is also aimed at radiotherapy induced xerostomia (Rix), commonly known as "dry mouth" in cancer patients.

BBC: Lamellar Biomedical website