Add Yahoo as a preferred source to see more of our stories on Google. Chattering teeth – that rapid, sometimes noisy clack of your upper and lower teeth – is a minor, startling symptom that can feel ...

Hydroxyapatite (HAP) toothpaste is a dental product that contains manufactured calcium phosphate. Calcium and phosphate are minerals that form 95% of tooth enamel and 70% of bones. NASA developed HAP ...

Chattering teeth – that rapid, sometimes noisy clack of your upper and lower teeth – is a minor, startling symptom that can feel embarrassing and confusing.