cockroach killer

I just discovered recently that cockroaches are easily killed by toothpaste.  Last night while I was brushing my teeth on the lavatory, a cockroach was on the sink. I opened the faucet to scare it. After being wet, it can no longer get out from the sink. I spit the bubbling toothpaste from my mouth after brushing my teeth on the insect.  In just seconds, it lied dead. I know your thinking, well, that’s how potent is my saliva (lol).

For trial: Use other toothpaste aside from Close-up Red Hot.