When the length of the tooth or the teeth exposed in the oral cavity is small and dentist wants to increase the length of the crown then a surgical procedure is carried out which is called as crown lengthening. In this Gum tissue or bone is taken out. This exposes more of a tooth 

When Crown Lengthening Of the Teeth Is Done

Crown lengthening is done when a tooth needs to be fixed. Sometimes, not enough of the tooth sticks out above the gum to support a filing or crown.  This can happen when a tooth breaks off at the gum line. It also can happen when a crown or filling falls out of a tooth and there is decay underneath. To place a filling or crown, your dentist needs to expose more of the tooth. This is done by removing some gum tissue or bone. Some people have a lot of gum tissue around their upper teeth. Dentists call this "gummy smile." This also can be treated with crown lengthening.
Before crown lengthening
             Before crown lengthening                       After crown lengthening

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