Could this new gel be the biggest dental breakthrough since the introduction of fluoride? THE GIST A new gel could soon eliminate painful fillings and root canals. The technology doesn't prevent cavities; it heals teeth by regenerating them. Although this is good news for teeth, the research could also be applied to heal bones and other tissues in the body. Dentists could soon hang up their drills. 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, according to a new...