Dentistry can be stressful. Running a practice is very stressful at times. Dealing with employees, insurance, unhappy patients that do not want to pay their bills, etc. That being said, it can be very rewarding. It sounds cliche but it is a wonderful feeling to help people. Whether it is getting them out of pain, helping their appearance and health, or providing a good experience with a fearful patient is very rewarding.
I love being a dentist. I have been practicing for just over 5 years. I had a previous career in the airline industry and find being a dentist is much more rewarding. The schedule is as flexible as you want to make it (provided you are in private practice).
Knowing what I know now, it would have been nice to have pursued dentistry sooner. I also would have specialized right after dental school as opposed to waiting a few years. Less debt, more freedom, etc. But that is my path and I wouldn't change any of it. The stress is worth it. Good luck