Can these black triangles get closed? (photos)

The first step is to wait..... Over time, tissues can fill in, or dermal fillers can plump them out.  If not, Bioclear is a great way to fill spaces or close gaps

Hello,Black triangles are quite common following orthodontic treatment. It is true that there are adjustments that can be done to close these if you were to go back into braces. But there are other options as well.First of all, I would wait several months before doing anything. This is to allow some time for the gums to mature and remodel. The gums will fill these types of spaces to some degree over time, but possibly not all of the space.If after some time, these black triangles remain, you can have resin bonding done to close these spaces. The healthiest and most predictable technique for this procedure is called BioClear. If this is the route you choose, I would search for a dentist in your area who uses this technique.