Or, just go to a Dentist, they can match any color of tooth and fill it in for you. Most will do it for a good breakfast.If you have some 'scrap ivory,' you can sand it to make a fine powder and place some of the fine powder in the chip and add a few drops of superglue. It will set up in a few seconds. Next you can add a little more powder and more superglue until you have built up the depression. Finally, you can sand the built up area with fine sand paper and even polish it if you wish.