While I was brushing my teeth, a cockroach was on the washstand. I sprayed a mouthful of toothpaste and vomited on it. I didn't expect it to die. What happened?

I think it may be that the toothpaste water you used has a high concentration and contains chemical components, so it was destroyed. It's like killing mosquitoes, which is harmless to human body, but it's hard to say for insects. It is also possible that you can see that cockroaches react quickly, the water they spit out is explosive, and people's potential is endless.