Three biggest concerns about neglecting your dryer vents.
1. Dryer vents become clogged with lent and can catch on fire due to the heat from the dryer. Without any warning you can find your dryer or even worse your home engulfed in flames.
2. When your dryer vents become clogged with lent you will notice clothes not drying after one cycle. You will have to run the dryer a few times to dry just one load of clothes. When this occurs the clothes can have slight mildew smell.
3. If neglected to long your dryer may start to malfunction. When this happens you are stuck paying for someone to come out and fix the dryer or just having to buy a new one.