Do i have to see a specialist to get a crown lengthening?

Should: Some dentist consider themselves as super dentist can do everything. I believe in referring to someone who does this almost dail. The best to use is a periodontist. They deal with the gum tissue.

Usually, yes: A crown lengthening is a procedure usually performed by a periodontist or specialist of the gums and bone that support your teeth. Some general dentists that have had training in such procedure are competent enough and can do it, usually for a lower fee. Most of the times, you'll find that a general dentist will refer you to a specialist for this kind of procedure.

No: A crown lengthening could be done easily by any dentist, as long as 2-3 mm bone reduction is done from the crown margin is removed to satisfy the biological width requirement. Moreover, there should be at least 2-3 mm of tooth structure below the buildup from the crown margin to satisfy the ferrule effect.

Preferable: I believe a periodontist is best suited to handle this well.They are experts in dealing w the bone and gum tissue, getting predictable results.