A "kick in the teeth" means disappointment of some kind. I was "kicked in the teeth" recently. It was a small matter, but the effect was great. I put it aside since the issue was so small, but later realized it was one of a series of similar actions that's added up to a big "kick in the teeth." Why does this series of actions have such a giant effect on me?
First, this is because it's an area of life that I'm hoping to improve upon, and each time I act in ways that work against that improvement, I realize that I still have work to do. It's frustrating to work towards change without the improvement you hope for. I'm not going to give up. Essentially I simply have to coach myself to work in more effective ways to create this change.
One reason this is so difficult is that the reality is far different than a setting I anticipated and expected. I have to recognize the reality that exists and operate with that reality rather than one I hoped for, invested in, and imagined. Also, though I don't want to accept this fact, the fact is that I have to be very careful about the words I use in this scenario since my words tend to elicit challenge - less words and share are needed in this arena at this time.
Onward.