Cockroach chalk is more effective and can kill cockroaches and ants that shouldn't enter your home. It is as simple as a line on the floor. Use HIT chalk to protect your home from ants, cockroaches and other crawling insects. Draw a line through chalk. These pests often crawl on the soil or any other surface. Once they cross that line, they will die, so rest assured, they will not dare to cross the HIT Chalk line.