This isn't about how clean your home is
Prevention habits are just practical routine, not a suggestion that anything about the home caused the original problem.
After treatment: what to watch for
For a while after treatment, it's reasonable to keep an eye on the same spots checked during the original inspection: mattress seams, bed frame joints, nearby furniture. Your specialist tells you specifically how long to keep watching for your situation and what would be worth a follow-up call.
Habits that make a difference
Checking secondhand furniture before it comes inside, being a bit more careful with luggage after travel, and not letting laundry pile up for long stretches near the bed are all reasonable, low-effort habits. None of these need to become a source of anxiety. They're just sensible routine, the same as checking a smoke detector.
Encasements & interceptors
A mattress and box spring encasement makes the seams inaccessible and easier to monitor going forward. Bed frame interceptors, small devices placed under the legs of a bed, can catch and reveal activity moving toward or away from the bed before it's otherwise noticed. Neither is a treatment on its own, but both are useful, low-key ongoing tools your specialist can explain if they fit your situation.
Common questions
How long should I keep watching after treatment?
Your specialist gives a specific timeframe based on your situation rather than a one-size-fits-all answer.
Do encasements need to be replaced regularly?
Not typically, a quality encasement is meant to stay in place long-term, checked periodically for tears.
Is there anything I should avoid buying secondhand?
Nothing is off-limits, a quick check of seams and folds before bringing any upholstered item inside is the main habit worth having.
Does prevention mean I'm still at risk?
Not more than anyone else, these are just sensible ongoing habits, the same as anyone might reasonably follow.