1. The words"the British have a sweet tooth" means that they like to eat various sweet things that ever exist.
2. There are such sweet things as candies, cakes, chocolate, ice-cream and etc.
3. I like chocolate and everything that is made of chocolate or with chocolate...
4. The British can eat sweet things any time they want to.
5. Sweet things make children feel happy but they also do harm: children`s teeth can be spoiled and children can put on their weight and so on.