A key to managing a busy and stressful life is having control over the emotional energy button: knowing when to turn up the focus and just as important, when to shut some things out.
Right now my own stress levels are through the roof through a lot of big problems demanding mostly emotional energy. I've found myself shutting out non-essential items in order to save enough emotional energy to deal with the big problems.
There are ways to boost and maintain emotional energy and some have it in abundance naturally. Personal and business coaches are a great help here.
Dealing with patients requires a lot of emotional energy and it is probably that factor that pushes dentists over the edge sometimes.