In a message dated 11/6/05 11:42:15 PM Central Standard Time, 
[email protected] writes:

> I recently purchased a tooth powder that advertises
> itself as an enamal hardener. I notice that the
> ingredients list tartaric acid.This sounds like it
> would potentially harm enamel. It has other things in
> it that sound very beneficial but I wonder about the
> tartaric acid.YOu really have to read labels.
> 
> 
Ingredients -- Tartaric acid 

DescriptionWhite powder. 

Tartaric acid is the molecule that makes unripe grapes taste sour. It is a 
principal flavor element in wine. 

Uses

Tartaric acid is used as a flavoring agent in foods to make them taste sour. 

The potassium salt of tartaric acid (potassium bitartrate or potassium 
hydrogen tartrate) is weakly acidic, and is known as "cream of tartar". 

Since it is a dry acid, cream of tartar is used in baking powders (along with 
sodium bicarbonate) to produce carbon dioxide gas when water is added. Other 
acids used in baking powder are fumaric acid and phosphoric acid