The Queen Mother was known as the "Smiling Duchess," according to Express UK. She earned the nickname because of her "strong character," not because of the aesthetics of her smile. Nicki Swift asked Dr. Chris Theodorou about the Queen Mother's famous smile, specifically what he noticed when looking at photos of her. "[Her] teeth most definitely betray imperfections in shape, color and alignment," he said.
Nicki Swift also asked Theodorou what could cause such issues, and whether or not they were genetic or environmental. "It is highly likely that the Queen Mother grew up with well water; well water does not contain fluoride, which helps strengthen one's teeth. According to the UK health authority, fluoride was only added to the UK's drinking water in 2003," he said. The Queen Mother died in 2002, wherefore the possible lack of fluoride may be the culprit for the visible condition of her teeth. "Fluoride makes the outer surface of the teeth hard and more resistant to acid and decay attacks and the [Queen Mother], bereft of this protective element, suffered the consequences," he said.
Interestingly, according to Live Science, too much fluoride can also cause teeth to discolor. "Although fluoride can be beneficial for teeth by strengthening the enamel and preventing decay, getting too much of the mineral is not good for your teeth color. Fluorosis, which results from excessive amounts of fluoride, may cause faint white streaks or brown spots on teeth."
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