The series which equips members of the public with a camcorder in order to pursue their own investigations into something that troubles them, makes them angry, or excites their curiosity.
Thisweekjonathanjones, 13, and David Hartley , 12, from Norfolk, find out whether toothpaste is really worth buying. They set out to discover what's in toothpaste, whether it really does our teeth any good, and which product works best.
Executive producer Debbie Christie
WRITE TO: Private Investigations, PO Box 5029. London W 12 6AG.