The main difference between a composite and porcelain facing is the way they are made. A composite veneer is made of a mixture of powder and resin, while a porcelain veneer is made by heating kaolin and other constituent materials. Composite facings are usually cheaper but are more fragile than porcelain facings. Porcelain facings have a smoother, shinier and more durable surface that lasts longer than composite facings. They are also less prone to staining and are more resistant to chemicals as well as heat. Composite veneers can be modeled in situ and can be more easily repaired if they break off.