Lint build up in your dryer or dryer vent can be extremely dangerous. Dryers are some of the highest sources of fires in your home.
You may not realize that this lint build up is happening as it is gradual and most people think that cleaning your lint filter can prevent this build up from occurring... not completely!
There are some ways of knowing that your dryer could be plagued with lint build up; if your clothes are taking longer to dry or not drying fully, call your local professionals in Atherton CA to come out and take a look. Better to be safe than sorry.