"Good" Bacteria Seen as Potential Cavity Fighters
 (New York, Reuters, 6/28/02)

Scientists at the Karolinska Institute in Huddinge, Sweden, led by Leonart Hammarstrom, used genetic engineering to give lactobacillus, the so-called "good" bacteria, the ability to produce antibodies against Streptococcus mutans, a cavity-causing bacteria. When they treated rats with this genetically altered lactobacillus, it greatly reduced tooth decay.