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Titanium dioxide is a common sunscreen ingredient that helps block the sun’s rays. Manufacturers use it in various industrial and consumer goods, from paint to toothpaste. Europe banned it as a food additive in 2022, but in Canada (among other countries), companies add it to foods such as salad dressings, frozen pizzas, pastries, chewing gum and candies to enhance their visual appeal. As The Wall Street Journal reports, some scientists are concerned about the potential health risks of eating it and what’s more, it can be challenging to tell when you are.