I Had Veneers Placed 1 Year Ago and Now Have Grey Coloring Near the Gumlines? (photo)

As I see it your dentist applied the veneers while blood was still present and it got absorbed by the cement that bonded them. When the blood dries it turns black just like a scab. I know because it has happened to me before and I learned the hard way. I remade all the veneers which was the right thing to do to eliminate my mistake. The staining could lead to future problems so all your veneers should be replaced to prevent that, as well as, making all teeth match in shade. Another complication you have is that the veneers are either too long or bonding cement is still present or not polished. This may be pushing against the attachment of the gums making them look swollen and probably bleed when you brush. This is called a violation of the biologic width. If your dentist has advanced cosmetic training he/she should have a dental laser in the office to shape the gum tissue to an appropriate point to avoid this situation. Seek a consult from a dentist who has advanced training and does cosmetic procedures on a regular basis.

 

It appears that the gums are very inflamed so they may not be sealed and attracting plaque and debris.  I would seek care from a dentist to have it looked at ASAP

 

 

It looks like the margins of the veneers might not be perfectly sealed and flush with your teeth. There might be decay or just stain at those margins. You also seem to have periodontal disease around them Get to a GOOD dentist ASAP.