Missy -
First of all, CONGRATS on the job!!!!!!
I spent 25 years in the dental field and started just where you are now. Only differences are that I was in another state and a year younger than you.
About the witness at the front desk. I want to strongly encourage you to start early to train her to not discuss her religion nor criticize yours. You can pretty much bet that either she, or her mother, or others in the congregation will witness to you on the job. Remember that YOU hold the key to how much pressure they will put on you and the sooner you squelch it, the easier it will be.
I had to address this a few times towards the end of my dental career - I had already become inactive and some witness patients wanted to use their wait and 'chair' times to do some incidental witnessing. As soon as the conversation switched to 'preach mode' - and we all know exactly when that happens! - I would stop them:
"Oh. Thank you, but, please. I'm really not interested. And also, I'm really uncomfortable discussing this at work. It's really not appropriate and it's not fair to Dr. so-and-so and it's not fair to my patients."
Those exact words... You probably won't have to say them again to the same person more than once. (Well some people need to hear it twice, but they learn if say it with greater emphasis!) Also, they will probably pass the word on to the rest of their friends...
Hey!! CONGRATS again!!!
I really enjoyed dentistry. If there is one thing I would do differently, though... I would have started my college carreer MUCH sooner than age 32. Even if you only take one class at a time - and that's quite doable - start now. You will be so pleased with yourself.
Enjoy!!
-Aude.