Dentists have a chart that uses numbers to help them make notations of healthy and problem teeth. If you listen to your dentist, you’ll learn a great deal about the current state of your dental hygiene. In Canada, we use the ISO/FDI system developed by the World Health Organization. In other countries, such as the US, dentists use another system known as the Universal System, or in the UK where dentists use the Palmer Notation Method.
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