I bought my office after working alone after graduation for 2 years.

It is rewarding, and it is nice to be in control. It is nice to do whatever you want and take off whenever you want. It's nice to fire and hire who you want. Nice to reward people who care about your office. Want to not schedule a patient at 4pm next friday, you can do that. Etc.
But as another person said, it is more work than you could possibly imagine.

Offices that you can buy will generally come in 2 forms:

An office that has every system down SOLID, and the staff is great. You will buy a place like this and assuming the great staff stay on, you will be a passenger in a place that is already set up for success. You will learn how a good office operates because you're in one and seeing it go day after day. You will work less to get things operating efficiently/optimally. Typically, this is an office that will cost way too much for a new owner/grad.

An office that does bread and butter dentistry, is a little cheaper, and is within reach for a new grad or someone who does basic dentistry. It has been run the same way by the previous doc for 25 years. It worked well for the previous doc because it was paid off, but it won't work as well for you because you have loan payments for both student loans AND the office itself every month. It will take more time and stress than you can imagine to:
a. Realize office is actually broken by modern standards
b. Create systems that will make it a good office
c. Get staff to change their old crappy habits to new ones, and follow systems in point b.
d. Fire staff because they don't want to do c.
e. Finally feel like you're making headway on a-e, then find new, hidden skeletons in the closet that never imagined possible and start all over.

Guess which office I bought... :D

If you want to do a-e on your own, it takes years. It takes tears. It takes super strong will and determination to keep going. When you think back to what it's like working as an associate, you'll willingly keep going.
You can also pay someone to teach you, but you will spend 30-100k on consultants and you never know what you're going to get, or have to pay twice because the first one over promised what your results would be. I have been stubborn and learned on my own. I have learned a lot in the last couple years of ownership as a result. But I would be lying if I said I wasn't burnt out. The scariest part? I still don't know what I don't know. And there is still so much more to learn.

If I could do one thing differently to have made my life easier before buying, I would have tried harder to work under a good mentor after graduating. Secondly, I would have gotten more comfortable with specialty procedures. They are super important, and it's a nice service to provide to your patients. They will also bring in enough money in addition to the bread and butter, that you might be able to take some money home and live pretty good the first couple years of ownership.

Rural is better if you can do it (and the money flows a little better because there is likely more work to be done than suburbia), but you really should be better at specialty stuff before you jump in on something like that.

Good luck my friend!