My house must be tasty, because they kept coming back even after (this was about 40 years ago, long before the EPA) a local exterminator dumped (literally) a 55 gallon barrel of pesticide around my house, twice. In 1971, after getting disgusted with the smell of the pesticides and the cost, a friend, who studied termite damage at Clemson, suggested sand and recontouring the grade around my house to help with drainage. He said termites hate sand, if the particles are of a certain size. If they are too large, then they can crawl between the particles. If they are too small, they're strong enough to move them out of their way. If the sand particles are just the right size, they can't move them or crawl around them. That's why certain types of sand work. Also, he said moisture will sometimes attract them. Thirty years ago, I had a lot of dirt that had been washed-out from around my house. I replaced that dirt with sand, when I added walls between the outside brick columns. I built those walls on top of concrete surrounded by sand. Also, I used to have standing water under my house. I put in gravel on one side of the house to help with water drainage, and I added plumbing to our tub and washing machine. Our tub and washing machine used to drain out under the house (yes, it's an old house!). Near where the tub drained was where the termites were at their worst. In October, it will have been 30 years since I did that, and I haven't seen a termite since. So, sand and moisture control worked for me.
TonyH mentioned that termites aren't that bad, because there are houses 200+ years old back east. Yes, but Formosan termites (as far as I know, they're the worst kind) weren't in the south until the mid 60's. I got hit by them hard in 1971, and they were front page news on and off here for a few years. We're dealing with a new type of infestation now.