The presence of which of the following makes a dental condition more severe?

The presence of clinical band mobility indicates that there is a significant compromise in the support structures of the tooth. This mobility typically suggests that the periodontal tissues, such as the gums and the bone supporting the teeth, are damaged or diseased. When teeth exhibit mobility, it points to advanced periodontal disease, where the attachment of the tooth to the surrounding bone is weakening. This situation heightens the severity of any dental condition because it signals that the tooth may become increasingly unstable, which can lead to loss of the tooth itself if not addressed.

Other factors such as excess plaque can contribute to dental problems, but they primarily indicate a risk rather than an existing severe condition. Crown resilience does not affect the severity of dental conditions but rather reflects the durability of restorative work. An epithelial junction plays a role in the health of gum tissue but does not by itself determine or indicate the severity of dental conditions as much as the mobility of the clinical band does.