Ants! help!

Designs by BSB
by Designs by BSB
Someone tell me they have success in keeping them out?! We have an exterminator, but these ants are persistent, I think they have grown immune to his treatments ... or our house resides on top of the world's largest ant hill!
We have bought Combat traps and Raid traps .. might slow them down, but no where near stops them. Anything out there that I can go by to keep them out of my kitchen?
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