Here are some ways to use "disarming" in a sentence:
1. Emphasize the natural quality of the smile:
* "She had a disarming smile that instantly put people at ease."
* "His disarming smile made it hard to stay angry with him."
2. Describe the effect of the smile:
* "His disarming smile made me forget my initial nervousness."
* "The child's disarming smile melted her heart."
3. Show the contrast between appearance and action:
* "He approached with a menacing frown, but his smile was surprisingly disarming."
In short, "disarming smile" implies a genuine, natural quality that makes someone less threatening or more approachable. It's not a deliberate tool or technique.