A patient comes to the office for an emergency visit. The patient complains of a toothache in the left mandibular posterior area. On clinical examination you notice a gray-to-white patch on the left posterior buccal mucosa. On questioning, the patient tells you that this area is also painful. After reviewing the patient's medical history, you question the patient regarding his recent use of:

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The Answer of A patient comes to the office for an emergency visit. The patient complains of a toothache in the left mandibular posterior area. On clinical examination you notice a gray-to-white patch on the left posterior buccal mucosa. On questioning, the patient tells you that this area is also painful. After reviewing the patient's medical history, you question the patient regarding his recent use of:

A Patient Comes to the Office for an Emergency Visit