Tooth decay starts by making the enamel slightly porous. It gets a frost white appearance. The decay then progresses in the softer dentin of the tooth. It grows unseen until it gets large enough to undermine the enamel. The enamel then caves in to reveal a brown decay area inside the tooth.
The following pictures are of Trina, a patient treated by Dr. Sam Sadati. Dr. Sadati is a mynewsmile.com network dentist from West Palm Beach, Florida.
If the cavities had been smaller, Dr. Sadati may have wanted to use direct dental bonding to restore the teeth. But when there is a substantial area of the tooth that is affected by the decay, porcelain is the material of choice, because of its strength and durability.