Do exterminators get rid of all bugs?

Exterminators can get rid of most common household bugs effectively when using integrated pest management, but no exterminator can guarantee getting rid of all bugs permanently and completely forever because new pests constantly try to enter from outdoors and some pests are extremely resilient. Professional pest control companies are highly effective at eliminating indoor infestations of ants, German cockroaches, bed bugs, fleas, wasps, and rodents when they correctly identify the species, locate nests and entry points, and apply commercial-grade baits, residual sprays, dusts, growth regulators, and heat treatment. For example, for German cockroaches they use gel baits that roaches carry back to the colony, and for bed bugs they use heat treatment above 120 degrees Fahrenheit plus encasements and residual chemicals, which can achieve near 100 percent elimination with two to three visits. However, complete eradication of all bugs in and around a home forever is not realistic because insects like ants, spiders, mosquitoes, and occasional invaders like boxelder bugs live outdoors and will re-enter through cracks, and because eggs may hatch after treatment requiring follow-up. Reputable companies offer guarantees and free re-treats if pests return between scheduled quarterly visits, and recommend ongoing prevention including sanitation, sealing cracks, reducing moisture, and regular inspections. Specialty pests like termites require ongoing monitoring with bait systems, and wildlife like raccoons require exclusion. So exterminators can get rid of current infestations of most bugs, but maintaining a bug-free home requires ongoing prevention and periodic service rather than a one-time spray.