The information you provide in your business answering machine greeting can vary depending on your specific needs, though some basic information is common. You should indicate the business that has been reached, including a specific name if you have a personal business number or extension. If the message is for general use, you might indicate that you are unavailable, though a message for use after business hours can provide the caller with regular business hours. You should not, however, use any language that could be taken to indicate that you are busy with a task that is more important than your caller.
A professional voicemail greeting is essential in many aspects of a business. In sales, it enables you to properly respond to inquiries from prospects and customers or discuss a deal in more detail. When they call, and you can’t answer, you may lose the opportunity for immediate communication and potentially lose a client or customer.

Generally, people that call and leave messages are more likely to be ideal customers of your business. Your voicemail message is often not much more than a formality to the person calling.
A dentist is similar to a doctor. Unlike a doctor, a dentist is going to get far more non-urgent calls as patients will want to know when they can pick up various orders, as well as to book follow-up appointments. The key here is prioritizing so the dentist can respond promptly to the patients who need emergency dental work and other urgent consultations.