Which of the following is an example of an unprofessional dental practice?

Practicing without a valid license is an example of unprofessional dental practice because it violates legal and ethical standards required to protect patient safety and uphold the integrity of the dental profession. A valid license ensures that a dental professional has met the necessary educational and competency requirements to provide safe and effective care to patients. Engaging in dental practice without an appropriate license exposes patients to potential harm due to unqualified treatment and undermines the trust that is essential in the patient-provider relationship.

In contrast, providing patient education, following infection control protocols, and maintaining patient confidentiality are all critical components of professional practice. These actions reflect a commitment to patient care, safety, and ethical responsibilities within the dental field. Therefore, practicing without a valid license clearly stands out as an unprofessional action that compromises patient welfare and violates regulatory standards.