Topic: Your dentist doesn't want you to know this!
A new peptide, embedded in a soft gel or a thin, flexible film and placed next to a cavity, encourages cells inside teeth to regenerate in about a month...
The new gel or thin film could eliminate the need to fill painful cavities or drill deep into the root canal of an infected tooth.
(Source)
Let me think: painful (and scary) drilling in my tooth and filling a cavity; or a little gel next to the problem... I know which one I'd prefer! 