When something is extracted from whole substance, its medicinal value decreases or becomes nil.
Market won’t sell curcumin-rich turmeric as they have found solution for cancer in curcumin. Curcumin extract is sold at much higher price so why would they give it to you free? 
This is curse of considering food as commodity.
To avail curcumin-rich turmeric, put some efforts. Do field trips and find farmers and buy directly from them.
If you can avail curcumin-rich turmeric (Most or almost all turmeric powder available in market are prepared by extracting curcumin oil.), it has many usages. Real substance in turmeric is curcumin. Curcumin-rich turmeric can cure many diseases like magic.
Here are few benefits for teeth. A paste using turmeric can be good alternative to your current unhealthy toxic toothpastes.
