Veneers are thin shells crafted from porcelain or composite resin, designed to cover the front surface of teeth. They're mainly used for cosmetic purposes to improve the shape, color or size of teeth. Being less invasive than crowns, they preserve more of the natural tooth structure. However, veneers may not be suitable for those with severe decay or damage as they do not provide as much structural support.
On the other hand, dental crowns encase the entire tooth and are commonly used when there's substantial damage or decay. Crowns are typically made from porcelain fused to metal, ceramic, or gold. They provide robust support and protection for weakened teeth due to root canal treatment, large fillings or fractures. However, preparing a tooth for a crown usually involves more extensive drilling compared to veneers.
Also, though durable, crowns may eventually wear out over time requiring replacement; this could potentially lead to higher long-term costs compared with veneers which tend to have longer lifespans. Lastly, if not properly fitted or if oral hygiene is neglected post-procedure there is potential risk for gum disease or decay underneath the crown.