London: Fluoride in some toothpaste and mouthwash, believed to prevent tooth decay, may actually be ineffective as the so-called protective layer it forms is too thin, scientists say.Experimental physicist Frank Müller and colleagues from Saarland University in Germany point out that tooth decay was a major public health problem worldwide, the journal Langmuir reports.
It would take almost 10,000 such layers to span the width of a human hair. That`s between 10 to 100 times thinner than what previous studies indicated. IANS
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