Sometimes effectively removing tooth decay requires the removal of a portion of your tooth. The removed portion is then replaced with a porcelain inlay or onlay. Dr. Obiokovitz or Dr. Tauschek customizes an inlay or onlay to fill the space left behind when part of your tooth is removed. Traditionally, inlays and onlays were made out of metal, much like traditional filings. Now, porcelain-milled inlays and onlays are virtually indistinguishable from natural teeth and provide relief from chewing pain, cavity pain and tooth degeneration.