saliva

A saliva test is also a reliable way to show a rise in oestrogen levels, which happens before ovulation.

Their research revealed that keratin produces a protective coating that mimics the structure and function of natural enamel when it comes into contact with minerals in saliva.

Other proposals under consideration could also see police allowed to rely on roadside saliva tests for evidence of drug-driving rather than blood tests, making it easier to prosecute suspects.

It is mainly a respiratory disease, which can be transmitted through nose to nose contact and also through contact with saliva, urine, faeces and milk.

Patients will be asked to submit more information and a saliva sample, with the overall aim of reducing the occurrence of the side effects in future, says the MHRA.