How come my teeth feel stronger when I eat certain foods?

I get a strong feeling in my teeth whenever I eat salmon, sardines, beans and mixed nuts but I don't get it when I drink milk. Does anyone else ever notice this and if so what do you eat that gives you that feeling? I imagine it must be good because I was on a 3 week bean bender before I got all 4 of my wisdom teeth out and I didn't need a single pain reliever afterwards!