I might try a different tact. Try talking to the company and negotiate a trial contract in which you ask to work for 1 month or 2 months, possibly at a slightly lower pay rate, to see if the company is for you. If the company is unwilling to do something that minor for you, then chances are, they are not as doctor friendly as you might want them to be.
Read through any contract you sign carefully. You may find all sorts of clauses in there. Sure they might fire you, but if you think you are the first dentist to think I can get out of a long contract by being a dick or by being lazy, you aren't, and it's likely that at some point Dental Dreams may have had someone revise the contract to make you suffer for it. Some people can be pretty vindictive.
Another chain dental was once run by a pretty vindictive dentist. When a dentist who worked for him decided to quit the way you are talking about the owner decided to mess with him. He started changing the dentists schedule to have him work at several different offices each week all around town. Then when he eventually let the guy go, he kept tracking him and anytime he tried to get hired within X miles of one of the companies offices he would go after him with the clause about having to not work within a certain distance of one of the company offices within so many years.
The owner never expected to win any of these, but the owner had so much money he just wanted to continually annoy and mess with the dentist and also make it harder for him to work and to have to deal with the lawsuits. Eventually he dropped all of it, but that's how some people are...
Personally, there are other ways to learn if a type of work situation is for you other than signing a 2 year contract and then figuring it out.
I have another friend who worked for a different smaller chain and quit some 2 years ago. He's still going back and forth in a lawsuit with that company over all sorts of stupid things in the contract. He has a lawyer deal with all of it and he doesn't have to worry about it most of the time, but every now and then we talk and he is still bothered by it. I just think if you minimize your headaches, you are better off in life.