system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does Velcro retain its strength through continuous use?

Given the basic hook-loop mechanics, I would think it would become significantly less effective extremely quickly.
gpt
There are a couple factors that explain this.  First, most loops don't find a hook each time the Velcro is sealed.  Only a minority of the loops need to find a hook for the Velcro to hold.  Second, not every loop tears when you rip apart the Velcro.  There are many times more loops on the one side than there are hooks on the other, so this combination of factors gives Velcro an appreciable use\-life.  

If you notice your Velcro is getting less sticky, you'll get more bang for your buck by trying to clean lint out of the hook side first.