Gum Discomfort/burning Sensation Just Above the Veneer, Is This Normal?

Most often, porcelain veneers have no issues at ALL.... However, the edges can be too close to the gums or other issues. Go back to the original dentist and see what HE says....

Since you have had four veneers placed and only the area above one is giving you grief, it is obviously a localized problem. Obviously you need to go back to the dentist who placed the veneer and resolve the gum problem. The veneer could have been placed to close to the bone abd the gum will not heal and is inflammed. Also the veneer could have been placed to close to the gum and there is constant irritation in that one area. I think the problem is resolvable and your dentist can take care of it. Do not continue to go on like this. Make the appointment and have him check the gum and the placement of the veneer. You mentioned you have good oral hygiene and a competent dentist so this issue should be resolved quickly.

It would be unusual to all of a sudden have an allergic reaction on just one veneer several weeks after placement.  Therefore, it is probably not an allergic reaction.   My recommendation would be to go back to your dentist hand have them take an xray and take a look at your gum.  It could be as simple as being a piece of bonding cement that dislodged and is irritating your gum.  Many patients feel that you are bothering your dentist to call them and ask for them to take a look, but most dentists want to know if you are having any problems right away.  So don't hesitate to give your dentist a call.