Hi Raquel, this may help
Or---you can sprinkle Diatomaceous Earth wherever they travel. It is safe for children and pets to be around. Please google it. You can eat it, feed it to your pets (and farm animals) for parasites and other disruptive whatevers, put it on them for fleas, etc. Very interesting, and very safe and helpful. They get it on them then take it back to their nest mates. It works by cutting their carapaces. (Eww... I know)
Sprinkle Borax behind dishwasher, washing machine, fridge, cupboards etc. Not too thickly. It will take a good few weeks to kill all the roaches if a big infestation, but soon you will see casualties lying on their backs kicking their legs. Also non toxic provided not consumed in large quantities, but make inaccessible to all but the cockroaches.