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The doctors reveal what lurks inside the plaque on your teeth.

The doctors meet Larry the vomiting robot to show the power of puke.

The doctors take a close-up look at how the eye works.

Dr Chris uses a tiny camera to reveal what happens in his throat when he swallows food.

Dr Xand meets a pioneering professor who makes body parts.

Dr Chris extracts snot from members of the public for a very useful experiment.

The doctors prove that we all have invisible ink inside our bodies.

Dr Chris proves that the younger you are, the more sounds you can hear.

A patient has an infection on his cheek and another has something stuck in his ear.

The doctors look at some of the show's best bits so far.

Dr Chris and Dr Xand look at what medicine was like in the First World War.