Although you may read about bonded veneers (sometimes called composite veneers) online, you'll have a hard time finding a dentist who recommends it often, especially for cosmetic reasons on your very visible front teeth.
However, they do have their uses as explained below.
Dental bondings (composite) are great for minor treatments, filling in minor cavities, and repairing chipped teeth. It's appropriate for use in the back of the mouth or areas not easily seen.
It's also used in prosthodontics and pediatric (children's) dentistry. Since it's a quick treatment, it can be handled in the office on one visit.
In general, bonded veneers are made from a durable composite material, which is mostly (about 75%) quartz and resin.
The material is pliable, like a paste and similar to an acrylic, which the dentist can sculpt into the desired shape directly onto the prepared tooth. Then, an intense light is used to cure the material and harden it.
Although you may find dentists willing to use this composite material for aesthetic reasons, and composite veneer kits exist for in-office veneer work, it is not normally the material of choice today.
The main problem is that the material is too porous and structurally weak compared to porcelain, is ceramic-based:
Porcelain on the other hand is tough and smooth. It's not porous and doesn't stain, think of glass. It's tough. To create it the porcelain material is fired at high temperatures inside a vacuum kiln. Think at how long ceramic tile lasts and keeps it color.
In addition, the material is very advanced today in terms of colors, translucency (see through-ness), and techniques available to a skilled aesthetic ceramist to craft lifelike dental restorations.
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