“As for Tristan da Cunha, its status as a dental utopia proved short lived. With the advent of a commercial canning factory for crayfish following the Second World War, Tristan da Cunha’s links with the outside world multiplied. As Tristan da Cunha became better integrated into the international system and income levels rose, the islanders’ consumption of processed foods soared. By 1966, over half of the islanders’ calories derived from imported foods. As the consumption of sugary, processed foods increased, so too did the incidence of cavities. By the end of the 1960s, Tristan da Cunha had earned the distinction of being “probably the best example of dental deterioration associated with the consumption of sophisticated foodstuffs enjoyed by populations with an improved standard of living.” https://nursingclio.org/2017/05/31/lady-mellanbys-dental-utopia/

During the 1920s and 1930s, a visionary British scientist named Lady May Mellanby, working alongside Sir Edward Mellanby, published groundbreaking studies demonstrating that dental decay is deeply connected to what we eat, rather than merely surface cleanliness. Through rigorous trials for the Medical Research Council, she proved that teeth are active, living tissues capable of self-repair. Her findings revealed that meals packed with fat-soluble nutrients combined with sufficient calcium, signal the inner dental pulp to form secondary dentin. This mineralized barrier shields the nerve from within, stopping an active cavity in its tracks. Conversely, heavy intake of grains containing phytic acid, such as oatmeal, interferes with calcium absorption and accelerates decay. A compelling real-world example came in 1932 from the remote island of Tristan da Cunha. Local inhabitants maintained nearly pristine teeth without ever picking up a toothbrush. Their daily sustenance revolved almost entirely around fresh fish, raw milk, and potatoes, precisely the nutrient-dense whole foods Mellanby advocated. Unsurprisingly, her work met fierce pushback from dental establishment figures who clung to the dogma that brushing alone prevents cavities. Drilling, filling, and eventually topical fluoride offered far more lucrative revenue models than teaching patients how to heal their bodies naturally through nutrition. To keep expectations realistic: while early mineral loss can be arrested and remineralized, a physical cavity that has eaten completely through enamel requires professional restorative care to fill the open space. As for Tristan da Cunha, its status as a dental utopia proved short lived. With the advent of a commercial canning factory for crayfish following the Second World War, Tristan da Cunha’s links with the outside world multiplied. As Tristan da Cunha became better integrated into the international system and income levels rose, the islanders’ consumption of processed foods soared. By 1966, over half of the islanders’ calories derived from imported foods. As the consumption of sugary, processed foods increased, so too did the incidence of cavities. By the end of the 1960s, Tristan da Cunha had earned the distinction of being “probably the best example of dental deterioration associated with the consumption of sophisticated foodstuffs enjoyed by populations with an improved standard of living.”