Slideshow: Top Problems in Your Mouth Teeth Whiteners That Work Dental (Oral) Health Quiz Toothache: Pain in the tooth or gum. The most common cause of a toothache is a cavity or an injury to a tooth that exposes the pulp, which is heavily supplied by nerves. From Oral Health Resources Can Oral Hygiene Curb Blood Sugar Spikes?Bad Breath: See How to Stop ItNatural Ways to Whiten Your Teeth Featured Centers When Prostate Cancer SpreadsEssential Tips to Manage DiabetesWhat Is Cystic Fibrosis? What Causes It? Health Solutions From Our Sponsors Kept Your Wisdom Teeth? What is TAVR?