What’s that?

Biotene (£7.50 for 50g, from Boots or biotene.co.uk) is a saliva-replacement gel to treat a dry mouth. The condition is often caused by certain medications and illnesses (such as diabetes and Sjogren’s syndrome), head and neck cancer or simply getting older, and can have an impact on your teeth.

Saliva is essential for oral health, and research has found that people with a dry mouth are three times more likely to experience cavities and suffer from tooth decay and bad breath.