Your clothes dryer lint filter is a very important part of the machine. The lint filter has a large effect on a large number of things. One is the amount of power your dryer can use when drying, the time it takes to dry the clothes and more importantly can become a fire hazard due to the machine overheating.
It's always recommended that you remove and inspect the lint filter after each use. At this time the filter should be cleaned and inspected for any damage. If damaged a replacement the filter should be installed.