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How to stop ants from coming into your home
Seal off all entrance areas.
Since ants are tiny, they can find thousands of tiny doorways into your residence. Some of them of are easy to identify; others will only be discovered when there's a parade of ants marching through them.
First, figure out where the ants are entering the house: follow the trail of ants to see where they're entering and leaving your home. Seal all the entrance holes that you can find using silicone caulk, putty, glue or plaster.