I had active subterranean termites a couple of years ago which caused me to do a full bathroom remodel. 🫠 It turned out that they had come up through a crack in the slab. I did tons of research and ended up doing DIY pest control (since I didn't have a termite control contract/warranty). I sourced all of my termiticide from domyown, which included treating the active infestation directly with termidor (and then leaving them alone for 2-3 months to ensure they were poisoned - note that they'll move to another part of your house if disturbed too much), trenching and treating around the foundation, installing a termite bait system outside, and finally spraying the studs with boracare (which lasts around 30 years).
I have trauma over that shit, luckily my studs weren't eaten much as they preferred the wood flooring.
Good thing more and more people are choosing cremation these days.