What step should be taken if a dental assistant notices a patient exhibiting signs of an allergic reaction during treatment?

When a dental assistant observes a patient showing signs of an allergic reaction during treatment, the primary and most critical step is to immediately notify the dentist and assist in providing appropriate medical care. This is essential for several reasons. First and foremost, allergic reactions can escalate quickly and may lead to severe complications, including anaphylaxis, which can be life-threatening. By alerting the dentist, the assistant ensures that a qualified professional can assess the severity of the reaction and administer the necessary medical intervention promptly.

Additionally, assisting in providing medical care might involve not only notifying the dentist but also preparing emergency supplies, such as epinephrine if indicated, and monitoring the patient's vital signs until help is provided. This coordinated approach enhances patient safety and enables the dental team to respond effectively to the situation.

While documenting the reaction and calling the patient's family are important considerations, they are secondary to ensuring that immediate medical attention is provided. Continuation of treatment in the face of an allergic reaction could exacerbate the situation and endanger the patient's health. Thus, the correct response prioritizes the patient's immediate health needs.