Short answers, pulled from the story.
An infected tooth from Italy partially cleaned with flint tools between 13,820 and 14,160 years ago represents the oldest known dentistry. This discovery predates the Neolithic site of Mehrgarh in Pakistan's Balochistan province by thousands of years.
John M. Harris started the world's first dental school in Bainbridge Ohio opening on the 21st of February 1828. The Baltimore College of Dental Surgery opened in Maryland in 1840 followed by the Ohio College of Dental Surgery in Cincinnati in 1845.
Ancient Egyptians bound replacement teeth together with gold wire while Phoenicians crafted dentures during the 6th to 4th century BC using gold wire and ivory teeth. Etruscans in northern Italy applied bridges and dentures as early as 700 BC.
Most dentists complete between five and eight years of post-secondary education before practicing. Degrees include Doctor of Dental Surgery or Doctor of Dental Medicine in North America and Bachelor of Dental Surgery degrees exist in the UK and Commonwealth countries.
Long-term occupational noise exposure contributes to permanent hearing loss known as noise-induced hearing loss with sound levels above 90 dBA damaging delicate structures of the inner ear. Chemical hazards include allergens from compounds like mercury methacrylate and nickel alongside disinfectants that introduce risks through inhalation or physical contact.