Gum
The soft pink tissue around the base of the teeth — the supporting tissue whose health the visible teeth depend on.
A gum in a dream is the dream's image of the supporting tissue around the base of the teeth — the soft material on whose health the more visible teeth entirely depend. The gum is rarely noticed when it is fine. The dream brings the gum when something in your life — the underlying support that keeps a more visible structure in place, a relationship's quiet basis, an institution's overlooked workers — is currently the thing whose state will decide whether the visible part continues to hold. A gum healthy and firm is the dream affirming the quiet base. A gum bleeding and receding, the teeth beginning to loosen, is the dream noting that the support has been neglected and the visible teeth are next to come out.