Do you know where ratios can be found at the dentist's office? You might not be thinking of math as you have your teeth cleaned, but in order to determine a beautiful smile, dentists can use ratios.
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More recently, esthetic dentists (dentists interested in developing beautiful smiles) studied this ratio and found that it describes an ideal relationship between certain teeth. When the golden ratio is present, the teeth come together in a beautiful smile.
How does this work? Well, an esthetic dentist can measure the combined width across both an upper central incisor and its neighboring lateral incisor, as well as the width of the central incisor alone. If the relationship between these two widths forms the golden ratio, then the teeth are in proportion and so is the smile. If not, then the esthetic dentist can use the measurements to adjust the person's teeth until the correct proportion can be found. Now that is a lot to smile about!
See for yourself: http://www.youtube.com/watch?v=PNQk_GJuZQo
Explore the ratios of your own body in the activity at the first link below. Check out the next link to learn more about the math behind the golden ratio.