Qustion about Exterminator Tactics and Safety - Chicago

[Jason Treadwell]

Hey everyone!

This is my first post on the site (not including my intro.) and I intend to do many more, thanks for your help on this so here it goes...

I recently just had an exterminator come by one of my rentals to do an extermination for mice and potentially rats. Besides setting traps and poison he also sealed holes found along the baseboard and walls. I believe he used polyurethane foam to seal the holes which were typically in corners or by the radiators

From a safety standpoint should I be concerned? Also is this a typical approach for covering holes?