Periodontist Removed 2mm From Gums, Now There Are Black Triangles Between Teeth, Is This Permanent?

Black triangles are always a concern, particularly, in the front of the mouth (also known as the esthetic zone).  The distance from the contact point between the two teeth and the height of the bone between the same teeth is the determining factor on how the gum tissue will fill the space (or black triangle).  If this distance is greater than 5 mm, the gum tissue usually will not fill the space completely, which can result in a black triangle.  Restorative measures can be taken in order to shorten this distance if it is greater than 5 mm, which will allow the gum tissue to fill the space.  The esthetics of the restorations necessary to shorten this distance may not necessarily be an improvement over the current esthetics with the black triangles, however, so you should definitely discuss all of the options with the restoring dentist as well as the periodontist about the possiblity of additional surgical options.