Black triangles and veneers?

Are the black triangles recent, or have they always been there?  Are the veneers recent or have you had them for several years?  Either way, it's important to see your dentist asap to see why you have the black triangles, and to have your gum tissues and bone examined.  You want to make sure you don't have excess bone loss.  Also, your dentist can evaluate any habits you have that may be contributing to those black triangles.  Often times to close black triangles, you can have veneers placed (in your case, redone) to close the spaces.  Make sure you do your research and see a dentist who is very experienced with cosmetic work prior to having any treatment done!

Hi:In order to give you accurate advice I need to look at a xray of the bone level and a photo of the black triangles.  Best,Dr. Maddahi

The black triangles are there due to your gums not filling in the area in between the veneers at the gumline. Sometimes a filler like Juvederm can be injected into the gums and will fill them enough to close off the space. Aside from that, the only way to close them is to have the veneers redone and shaped differently.