Your gums under one tooth that has a procelain crown is turning black and it feels like burnt. What going on?

There are several reasons why your gums might be turning black and could feel burnt under a porcelain crown. Some possible explanations include:

1. Marginal Discoloration: Porcelain crowns can sometimes cause the surrounding gum tissue to appear darker or black due to the shadow cast by the crown's metal margin. This is a common problem with all-metal or porcelain-fused-to-metal crowns.

2. Amalgam Tattoo: Have you had an amalgam filling (a type of silver-colored filling) in that tooth or adjacent teeth in the past? Amalgam tattoos occur when small fragments of amalgam leach out and become embedded in the surrounding tissues. These tattoos appear as gray, brown, or black areas in the gums and can resemble burns or discoloration.

3. Trauma: If you've experienced recent trauma or injury to your gums or the tooth, such as a forceful bite or an accident, it could lead to localized bruising and darkened gum tissues.

4. Poor Oral Hygiene : Lack of proper oral hygiene can cause inflammation and infection of the gums, leading to discoloration and discomfort.

5. Other Dental Problems : In rare cases, black or burned-like discoloration of the gums can be a sign of underlying dental issues like an abscessed tooth, root canal problems, or even oral cancer.

Given the burnt sensation you describe, it's important to seek prompt evaluation by your dentist or dental professional to determine the exact cause and receive appropriate treatment. They can perform a thorough examination, including X-rays, to identify the underlying issue and recommend the best way to address it. Self-medication or remedies are not advisable in this situation.