If you are refilling traps every month, you are managing symptoms. Here is the fix.
A house mouse reaches breeding age in about six weeks. As long as the entry gap exists, removing residents just makes room for the next ones.
Garage corners, dryer vents, utility chases, crawl space vents, weep holes, sill plate gaps, roof-line junctions and air conditioning line-set penetrations account for the overwhelming majority.
Copper mesh and steel screen, never foam alone, mechanically fastened, with a written map of sealed points so the work can be verified and warrantied.
Droppings and urine carry pathogens and pheromones. HEPA vacuuming and antimicrobial treatment both protect your family and remove the scent trail that recruits new rodents.