Scientists have developed a chewing gum containing friendly bacteria which they say can help prevent tooth decay.
Bacteria cause tooth decay
The good bugs in the gum prevent other harmful mouth bacteria from sticking to and attacking the teeth.
Toothpastes and mouthwashes containing Lactobacillus anti-caries are also in the pipeline, German chemical company BASF told Chemistry and Industry.
Friendly bacteria, normally found in live yoghurt, are already purported to be good for treating bowel conditions.
Another potential use of Lactobacillus include the prevention of body odour. BASF are looking to produce a deodorant which can stop the odour-producing bacteria in the armpit.
The bacterium responsible for dental cavities, Streptococcus mutans, persistently colonises the surface of the teeth, where it converts sugar into aggressive acids that breaks down the enamel.
L. anti-caries reduces the concentration of this harmful bacterium in the mouth making S. mutans clump together, preventing them from adhering to the teeth.
The BASF scientists say the gum has been tested on large numbers of people and has the ability to significantly reduce bacterial levels.
Dr Andreas Reindl of BASF said: "The effectiveness has been demonstrated and the first oral hygiene products containing probiotic lactobacilli are scheduled to appear in 2007."
Dentists advise that the best way to keep your teeth in good condition is to ensure that you clean them regularly to get rid of any plaque build up.
It is also important to have a regular check up at the dentist - most suggest once every six months to a year.
Dr Gordon Watkins, a member of the British Dental Association's health and science committee, cautioned: "These new products will not remove the need to brush your teeth as their action is targeted against just one bacterium.
"It's not a substitute for brushing the teeth, because this removes the plaque that contains a whole range of bacteria that causes gum disease and bad breath.
"The best way to minimise tooth decay is to reduce consumption of sugars; strengthen the teeth through the use of fluoride; and brush teeth to remove dental plaque."
The World Health Organization estimates that 5 billion people world-wide suffer from tooth decay.