Another point to mention is that, in the eyes of the patient, often times their wants > needs. If a patient really wants his non-decayed fractured #8 fixed with a crown, and you start off talking about 4qd SRPs, there's a good chance you will lose the patient's interest and trust. In practice, often times it is best to start with what the patient wants first (barring any severe needs like abscesses, etc), and then getting to their needs. This shows that you are paying attention to their concerns, that you are actively listening, and by some equivalence, that you are trustworthy as a doctor.
Often times in dental schools this gets especially difficult because there are systems in place and things go according to the system (urgent > disease > restorative > maintenance, etc). So in your situation in school clinic, it is at the very least a good idea to start with mentioning their chief concern, and then getting to what they need. Even just mentioning it makes a difference.
Using the same example you have two scenarios (very simplified 😛). Which sounds better?
"Okay Mr. Jones we finished your exam, based on what I can see you have very bad gum disease etc so we're starting with 4qd SRPs. Then, it looks like a few of your fillings have new cavities underneath them that need replacing, and finally there's the tooth in the front that's chipped that needs a crown"
"Okay Mr. Jones we finished the exam. I can definitely see what you're talking about that front tooth being broken, and I know that was the main reason why you came to our clinic. I do actually see some other big areas of concern that I would like to talk about if that's okay. [etcetc]. I will talk with the instructors if we could start with that front tooth first, but even if we do have to start on the actual disease parts first, I want you to know that fixing your front tooth is my top priority."
Even if you just said the second bolded sentence and nothing else, just the fact that you're acknowledging it gives the patient peace of mind that you are listening to him. All too often dentists, especially students & recent grads, make the mistake of rambling on to the patient about what all he/she needs, without listening to why he's there.
EDIT: Gosh I wrote a lot. Wrapping things up, while it is definitely a good idea to keep models, use animations, drawings, xrays, etc to visually show the patient his/her situation, I would say it is even more important to have good discussions with the patient, listening, making connections, etc, to earn their trust. You can show a patient his cavity, but if it's not his concern, he's not going to want to fix it.