December 3, 2013 report
Scientists create candy that's good for teeth
After you eat, bacteria attached to the surface of your teeth release acid. Slowly, this acid dissolves your tooth enamel. As the enamel wears down, cavities can develop. The strain of bacteria most likely to cause cavities is mutans streptococci. When you chew, you shed mutans streptococci into your saliva. Swallowing or spitting removes some of the bacteria from your mouth after you finish chewing. The remaining bacteria reattach themselves to your teeth.
The researchers knew that another type of bacteria, Lactobacillus paracasei, found in kefir, reduces levels of mutans streptococci and decreases the number of cavities in rats. A sugar on the surface of L. paracasei binds with mutans streptococci. Lang and her team think that by binding with mutans streptococci, L. paracasei prevents mutans streptococci from reattaching to teeth.
To test whether L. paracasei could help prevent cavities in people, Lang and her team developed a sugar-free candy containing heat-killed samples of the bacteria. They then tested the candy on a group of 60 volunteers. One third ate candies with one milligram of L. paracasei, one third ate candies with two milligrams and one third ate candies that tasted the same, but contained no bacteria.
Each of the subjects ate five candies over a one and half day period. At the end of the experiment, about three fourths of the volunteers who'd eaten candies with bacteria had significantly lower levels of mutans streptococci in their saliva than they'd had the day before. Subjects who consumed candies with two milligrams of bacteria experienced a reduction in mutans streptococci levels after eating the first candy.
The researchers point out that they by using dead bacteria, they were able to avoid problems live bacteria might have caused. Killing the L. paracasei does not destroy the sugar that binds with mutans streptococci. L. paracasei does not bind with beneficial oral bacteria. This makes it a better choice for cavity prevention than other probiotics.
Reducing the burden of pathogenic mutans streptococci is a goal of oral health. Lactobacillus paracasei DSMZ16671, even after heat-killing, specifically co-aggregates mutans streptococci in vitro and retains this activity in human saliva. In rats, it reduces mutans streptococcal colonization of teeth and caries scores. This pilot study sought to assess the potential of heat-killed L. paracasei DSMZ16671 (pro-t-action®) to reduce levels of salivary mutans streptococci in humans, using sugar-free candies as a delivery vehicle. A randomized, placebo-controlled, double-blind in vivo study of three groups examined the short-term effect of sugar-free candies containing 0 (placebo), 1, or 2 mg/candy piece of heat-killed L. paracasei DSMZ16671 on the levels of salivary mutans streptococci determined before and after consumption of the candies. The candies were consumed 4 times during 1.5 consecutive days. Compared to the placebo group, the test groups' saliva had significantly reduced mutans streptococci as an immediate effect. These results suggest the use of heat-killed L. paracasei DSMZ16671 in suckable candies as a method to reduce mutans streptococci in the mouth and, thereby, caries risk. We think this a new concept and strategy for caries prevention and management.
Tip: Science magazine
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