Do you do tooth-colored fillings for back teeth?

Yes we do.  Composite resin is the most common filling material used in the United States today, and is a vast improvement in appearance compared to the metal silver amalgam fillings that used to predominate.  In the interest of full disclosure, composite fillings cost a bit more than silver amalgam and need to be replaced far more frequently than silver amalgam.  They also have a reputation for causing teeth to be more sensitive than silver fillings do.