acidity

Aleasha, 20, said it was a "big shock" when questions about "the acidity of volcanoes" came up in her science exam, rather than the health-based questions she had been preparing for.

This prolonged exposure increases the acidity of the mouth, erodes the teeth and causes cavities.

For Ms Nkhana and her colleagues, the key to a good banana wine lies in the balance of sweetness and acidity.

For people with an overactive bladder, the acidity might also aggravate the urinary system.

This helps rinse the teeth and return your mouth's acidity back to normal.