The ease with which saliva can be summoned up differs a lot between people.
Our top tips for filling the tube are:
- Gently bite the side of your cheek a few times.
- Do it first thing in the morning.
- Do it on an empty stomach, and about 10 minutes after drinking a large glass of water.
- Take your time: you don’t have to provide the whole sample in one go; it may take 10 minutes for some people to generate enough saliva.
- Avoid smoking before providing the sample.