As I was brushing my teeth, I noticed that my parents have changed the brand of toothpaste that they use. They’ve switched from non-fluoride, Aloe Vera based toothpaste, to a fluoride toothpaste for sensitive teeth. I remembered that as a child, if I stayed round a friend’s house, and they used a different toothpaste to the one my parents bought, the flavour seemed radically different to me, and often disgusted me so much that I could only use a tiny bit on my toothbrush. Now - using this new toothpaste - I could barely taste it at all, let alone differentiate between it and the brand that I use at my own house. I decided that it must be something to do with the amount of salt I now use on my food.