It's like weird Toothy truths
4. Whitening teeth with wee
Back in the 1st Century, the Roman poet Catullus wrote in verse about how the Spanish kept their teeth white. They brushed them and rubbed their gums with their 'own morning urine'. This is massively gross but not quite as crazy as it sounds because urine was used to clean clothes for centuries. Dental experts reckon ammonia in the urine was the active ingredient
