It's your sanctuary from the outside world, but would you know if your home sweet home was making you sick? Dr. Oz welcomes contractor Mike Holmes to reveal the 4 most toxic rooms in your house. Zones 3 and 4 are the basement, home to asbestos, radon and deadly gases that can be emitted by your furnace, and the backyard, where decks built before 2005 can contain pressure-treated, arsenic-infused wood. Learn how to detect potential toxins in your home - and how to eliminate them.

Click here to watch part 1: toxic zones 1 and 2.

Want to know how to look marvelous without splurging so much? Dr. Oz invites three beauty experts to share the smartest ways to save money while looking fabulous starting from your hair and makeup tools to the beauty products you use.