What the Heck Is Toothpaste Anyway?

It's been part of humanity's hygiene regimen for more than 4,000 years, but have you ever stopped to think what's actually in the stuff you're smearing across your teeth? The ingredients of modern toothpaste may read like a mad scientist's shopping list, but they're far better than what our ancestors had to endure for… » 8/05/14 2:20pm 8/05/14 2:20pm