The National Fire Protect Agency recommends a yearly cleaning to prevent dryer fires.
Signing up to Swift Vents mailing list will send you an email annually (one year from the month of your last cleaning), to remind to get your dryer vent cleaned and give you the best opportunity to prevent a possible dryer fire.
If you want to learn more about the benefits of getting your dryer cleaned annually and why the National Fire Protection Agency recommends it, click here.