Mites and Worms

[ian1]

Could someone tell me the basics of mites and worms?

A quick rummage around the site gave lots of specific questions but not the basics.

Should I be regularly mite spraying as a routine?

My birds don't go outside but I do open mesh covered windows...do mites get in or are they everywhere anyway?

Is there any certain giveaway that mites are a problem?

One of my birds is head scratching a little more than usual (he has a LOT of pins just coming through though). There are all sorts of creepy crawlies around here so mites wouldn't suprise me.
I do keep the cage clean but they do tend to trash the area.

Thanks

Ian

In the time it took me to write this I lost 4 shirt buttons to 'the beak'.