If you leave a tooth in a glass of Coca-Cola overnight, will it be dissolved in the morning? According to Snopes, it will not. The experiment reported here shows the same result, and also supports the stronger claim that Coca-Cola has no or very little dissolving effect on teeth.
In the morning, approximately 12 hours later, the tooth had not dissolved. Examination by a non-expert showed no change in the size or shape at all, but it had been discoloured:
There was still no apparent change in size or shape, but the tooth was badly discoloured:
The tooth was now completely black, but there was still no apparent change in size or shape. No mushiness or other effects, except the change in colour, could be detected.
After the sixteen-month experiment, mold was growing on the surface of the Coca-Cola, and it is possible that the sugar in the drink had been consumed by the mold. Replacing the liquid with fresh Coca-Cola, for example every week, may show different effects on the tooth.
Here is a link to another experiment with a tooth in Coca-Cola, with somewhat different results: http://thecocacolaexperiment.blogspot.com/