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For gingivitis, Consumer Reports’ consultants advise that you consider a mouth rinse with stannous fluoride, cetylpyridinium chloride or the essential oils thymol, menthol, eucalyptol and methyl salicylate.

“I would tell my patients if they are concerned about triclosan that stannous fluoride is also very effective for reducing plaque and gingivitis,” said Dr. Niederman.

They were separated into three groups, one assigned to a toothpaste without antibacterial properties and the others assigned to antibacterial toothpastes containing either stannous fluoride or triclosan.

In solution minute quantities of gold may be detected by the formation of “purple of Cassius,” a bluish-purple precipitate thrown down by a mixture of ferric and stannous chlorides.

The colour is developed gradually as the temperature rises; it may be rendered brighter by the addition of stannous chloride.