Porcelain inlays and onlays are used when decay is too large for a filling, but not large enough to justify a crown. Dr. Andrews removes the defective tooth structure and replaces it with a natural ceramic material, which he custom-designs for each tooth. This material is bonded into place with composite cement, rendering it virtually invisible. Dr. Andrews then restores the teeth to nearly their original strength with a material that is wear-resistant and far more beautiful than a direct, tooth-colored filling.