Yes, dental crowns are a permanent treatment option. They can last at least 10-15 years if you take proper care of them and maintain good oral hygiene.

A tooth crown may be necessary to restore a badly broken down or decayed tooth. It is also required after a root canal treatment as the tooth becomes weak and needs to be protected (to avoid serious fracture). 

Dental crowns come in many materials, depending on your needs and requirements. You can have stainless steel, all-metal (gold and other alloys), metal fused to porcelain, all-ceramic, and all-resin crowns. The most commonly used crowns are metal fused to ceramic, all-metal and all-ceramic crowns.