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Lots of fat and hardly any carbohydrates - that's the keto diet in a nutshell. What at first glance seems to contradict all conventional dietary recommendations has developed into a real trend that is said to help you lose weight and have other health benefits - and is the subject of controversial debate among experts.

In this article you'll find everything you need to know about the keto diet: What can you eat? What does ketogenic actually mean? And is the keto diet healthy or not?

Every child knows that: Brushing your teeth is important. But are you actually brushing your teeth properly to remove plaque and to stop your gums receding? Why do we have to brush our teeth at all? What is the – scientifically-backed – best technique? And which mistakes should you avoid at all costs?

There used to be a widespread belief that tooth worms were the cause of tooth decay and toothache. Today we know better. And a lot has happened in between.

In this article you will find out, among other things, why people chewed special branches in earlier eras, why dental hygiene was reserved for the wealthy social classes for a long time and why Queen Elizabeth I with her pitch-black rotten teeth was considered an aesthetic role model in the United Kingdom.

But let's start with the very earliest beginnings of dental hygiene.