If Tokugawa Ieyasu Appeared in Modern Tokyo, Would He Die in Hours?

Dog Diner Co., Ltd. (Location: Akasaka, Minato-ku, Tokyo; Representative Director: Maako Ishida) has released a column discussing environmental changes in modern times from a historical perspective and the importance of oral care. The background highlights that modern Tokyo summers frequently exceed 38 degrees Celsius, whereas about 500 years ago, during the Edo period when Tokugawa Ieyasu lived, temperatures were around 28-32 degrees. PM2.5, dioxins, and photochemical smog did not exist then. Despite being the same Tokyo, the environment has completely changed. An astonishing fact is that if a modern person were to time-travel to the Edo period, research data estimates their survival period to be 3-5 years. The top three causes of death would be: 1st: Smallpox (modern humans have zero immunity), 2nd: Dysentery, cholera, infectious gastroenteritis (no antibiotics), 3rd: Sepsis from periodontal disease. The most notable risk, periodontal disease, still has no complete cure in 2026, even in an era where humanity aims for the moon and AI draws pictures. Once contracted, periodontal disease is incurable. Regarding its impact on dogs and cats, data from the American Veterinary Dental College indicates that approximately 80% of dogs over three years old already suffer from periodontal disease. Humans can brush their own teeth, but dogs and cats cannot protect their teeth themselves. A large-scale study by Banfield Pet Hospital shows that dogs with advanced periodontal disease have a 1.4-1.6 times higher mortality risk compared to those without. Dog Diner Co., Ltd. addresses this issue by advocating the "Eating Toothbrush Revolution," an additive-free formula that can be simply sprinkled on food, suitable for pets that dislike toothbrushes, and designed for easy daily continuation. They state, "This is modern times, not the Edo period. There are ways to prevent it." The "Eating Toothbrush Revolution" is an additive-free powder and sprinkle supplement that can prevent bad breath and periodontal disease by simply adding it to food. © 2026 Copyright Dog Diner Co., Ltd. Eating Toothbrush Revolution Copyright. For the full column, visit note: https://note.com/dogdiner/n/n4cc7703a3e3b and Rakuten column: https://www.rakuten.co.jp/dogdiner/contents/hamigaki6/. Company Overview: Company Name: Dog Diner Co., Ltd. Representative: Maako Ishida. Location: Akasaka, Minato-ku, Tokyo. Business: Online sales of health foods for dogs, cats, and pets. Official Website: dogdiner.co.jp. Rakuten Ichiba: https://www.rakuten.co.jp/dogdiner/. Contact: MAIL: dogdiner@dogdiner.co.jp.