Explain the cause of inflammation of gums around a fronttooth crown. i did not have a root canal and there is nopain.

Inflammed or infect: Inflammation can be just that (red, swollen, tender to touch, warm). And will heal with time. Or there could be abnormal pressure from adjacent tissue/structure or infection. Check with the dentist.

Gum problem?: It could be the crown edge is too far under the gum, too thick or too close to the bone. Or it could be a bad reaction to the metal crown alloy, if any.

Could be ..: If the tooth has a crown on it - it could be the crown or just the recent placement of the crown. If it is a natural tooth - get a cleaning of that area and see if it resolves.

Find the source: The source of the inflammation should be determined. Possible causes of inflammation are: gingivitis, periodontitis, ill fitting crown or biological width impingement (the crown is too close to the underlying bone).