Our Deans pest person, mentioned that all of our drains have a Ptrap, and roaches can’t enter through them. They can flatten out and fit under your doors, I caught one to show deans, in a disposable coffee cup with lid, tiny opening to drink from. Sat it in the lanai, sure enough it crawled out of that tiny hole, dean found it, identified as a palmetto.
Once in the house will crawl down the drain to get water. They can go 30 days without food, but only 3 days without water, then they die.
Those who don’t have a home watch, need to cover drains, and use Saran Wrap on toilets. If the toilets dry out the roaches will come in the hundreds through a dry toilets from the sewer. That will be an infestation. This is the advice from my Deans pest rep, who is a wealth of information on even the tiniest bug.
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Do not worry about things you can not change 
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