I'm not afraid of hard work. My high school frequently has people come back from college (including Ivies) and tell the teachers that college is so much easier than high school was. And indeed, I was more challenged by high school courses than I have been by my college courses.
I would wake up at 5:45am, go to school at 7, come back at 4pm, and work till 11/12. And no this is not because I was lazy or procrastinated. I legitimately had that much work taking on a full honors and AP schedule, being involved with tons of groups, etc.
I know the kind of effort it takes to succeed when you're being overwhelmed with work.
I consider myself to be good not at stress management, but at stress elimination by keeping the bigger picture in mind. I think mindset matters a lot. If you have a confident mindset that promotes the notion that you will inevitably graduate from dental school and will be able to complete all the tasks and do a good job, then it doesn't matter how much work is thrown at you. You can do it.
So while I appreciate your concern for me, don't worry about me too much.