Tooth enamel is the hardest substance in the human body, but, until now, no one knew how it managed to last a lifetime. The authors of a recent study conclude that enamel's secret lies in the imperfect alignment of crystals.
A toothache is a painful annoyance, especially at night. Getting a toothache at night can make falling asleep or staying asleep very difficult.
New research finds that brushing the teeth three or more times a day significantly reduces the risk of atrial fibrillation and heart failure.
