Which of the following phrases should be avoided according to the telephone doctor?

The phrase that should be avoided, as indicated by the telephone doctor methodology, is one that conveys a lack of willingness to assist or a dismissal of the caller's needs. "That's not my job" directly communicates a refusal to help and can be perceived as unprofessional and unempathetic. This type of response can be detrimental to customer service and can leave clients feeling undervalued and frustrated.

In contrast, the other options focus on support and service. Phrases like "How can I help you?" and "I will check on that" show a readiness to assist and address the caller's concerns. "Let me transfer you," while it may indicate a need for further assistance, also implies that the call is being taken seriously and that the caller's needs are being prioritized. Overall, it's crucial to foster a positive and helpful communication atmosphere in a dental office setting, which is why avoiding dismissive language is essential.