Calls will still technically be delivered to your phone, but your phone will not alert you to the call. This is a handset block and not a network block. You can put a network block on persistent telemarketers, but you need to contact your network provider for that. To view voicemails from blocked calls, go to Voicemail, then scroll all the way to the bottom and tap “Blocked Messages.”
Before you push record, be sure to tell the person on the other end of the line you're recording; depending on your location, you may be breaking a law if you don't. Some US states—like New York and even the feds—only require one-party consent, which means you can record without telling the other person or persons. In California, all parties must know they're being recorded—even if the recorder is out of state. Under federal law, one-party consent is okay, but only if you're part of the conversation; otherwise that's considered eavesdropping.

Website: https://www.phone.com/phone-support/features/how-do-i-set-up-my-voicemail/
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.