Bonding on Teeth Revised: Gums swollen and Purple with an Infection: Should I be Concerned?

Based on your description, it is unlikely that the bonding is the cause of your teeth wiggling, but the black line and the swollen gums may be a direct result of the bonding.  Bonding below the gum-line is not optimal, but it is not a problem that is not repairable.  I would recommend returning to your dentist and making them aware of the black line and asking him/her if they can adjust that area for you.  In my opinion.  It should be a relatively easy fix that will alleviate your future symptoms.  Good luck and I hope this helps. Follow me if you have more questions.Sarah Thompson, DMD

If you bonding is causing gum problems you should have your dentist reshape and remove overhangs. Ideally your bums should be pink and firm

It is preferable that bonding not go below the gums, as the dentist doesn't have a much control working in the gum sulcus.  However, if is is there, then it needs to be smooth (polished) with no gaps or ledges that will accumulate plaque.A rule of thumb is the less that one needs to accomplish with the tooth, the better the results will be with composite bonding.  However, the more the problem or space that has to be closed, the better choice (that will give the dentist the most control) is porcelain veneers.Whether your problem can be corrected with just some reshaping and polishing of your composite veneers is something your dentist will have to explore.  If things don't get resolved, then consider veneers.  They are much smoother, many times stronger, more color stable (won't darken or stain like composite bonding does over time), fill the gaps or spaces between teeth better, and usually look much more natural looking.