My mother-in-law is a dentist. When she heard I always brush my teeth but rarely floss, she told me flossing is more important than brushing your teeth. For once I didn't get into the science of things, but still I accept that getting old bits of food and other junk away from between my teeth can only be a positive thing.

It runs counter to my sceptic nature, I like to question everything, but I'm slowly starting to learn that sometimes you just have to take an expert's advice.

I'm sure any half-way decent dentist can see pretty quickly how well you take care of your teeth, in the same way a seasoned programmer can often point out a beginner's bad code or a civil engineer warn about the wrong way to build a bridge or a house on a swamp.