Which of the following is a common outcome when there is increased tooth mobility?

Increased tooth mobility often indicates underlying periodontal issues, such as bone loss, periodontal disease, or other conditions that compromise the periodontal support structures of the teeth. When teeth become mobile, it usually signifies that the attachments that keep the teeth stable in their positions are deteriorating. This situation elevates the risk of tooth loss because the supporting structures (bone and gum tissue) are unable to provide adequate support for the tooth.

As teeth become more mobile, it may become more challenging for patients to maintain proper oral hygiene, which can exacerbate periodontal disease and further contribute to the risk of losing the affected teeth. In summary, increased tooth mobility leads directly to an increased risk of tooth loss, making this choice the most accurate in the context of this question.