Clean the dryer lint filter every cycle and check the vent
Added
Clean the lint filter before and after each load, clear lint that builds up behind the dryer, and make sure the vent hose isn't crushed or blocked and the outside vent flap opens while the dryer runs. Never run the dryer without its lint filter.
The result
Result: U.S. Fire Administration: you are at higher risk of a clothes dryer fire if you don't clean your lint filter and dryer vents.
Source
U.S. Fire Administration (FEMA) (opens the original source in a new tab). Check it for the latest numbers before you act.