Namaste,

Source: http://bombayelectric.tumblr.com/post/32741855768/third-eye-gandhi

1. Stop watching TV:
   Through watching TV you lose your connection to your inner dimension. The television changes your vibrational state so that you are more susceptible to absorb information without knowing it. It also shows a lot of violence and ignorance, which keep you in an unconscious state. In my personal experience not watching TV anymore expanded my view of life. It was like waking up after a deep sleep and seeing all the colors more brilliantly afterwards.
2. Avoid fluorid:
   Fluorid can mainly be found in tooth paste and in some regions of the world even in tap water. It calcifies the pineal gland, which is very strongly connected to the Third Eye. The pineal gland is also known as the center of consciousness and the place where dreaming is happening. When the pineal gland gets calcified it won't work properly. It's then like a rusty door which one can hardly move. To decalcify it, buy a toothpaste without fluorid in it and if you're tap water is contaminated, use bottled water and drink it out of a copper cup. This will re-awaken the water and its healing properties. 
3. Meditate:
   Meditation not only helps you to open your Third Eye, but also to find the peace within you. Our society is in a constant stress situation with no way out of it. So it's important for planet earth and our evolution as human beings to stop running from this place to that place to find happiness and instead turning inside and realize what true happiness really is. If you are interested in listening to a guided meditation on opening your Third Eye, feel free to listen to this one here. 
4. Listen to your gut feeling:
   Many times our gut feeling has prevented us from unwanted situations or wrong decisions. In fact intuition is nothing more than to listen to ones gut feeling. When you are able to shift your attention from your head into your body, you can listen to it and respond accordingly. Try to listen as often as you can to your gut feeling. This allows your intuition to come forth and thus enables you to open your Third Eye.
5. Listen to spiritual teachers:
   A good advice is to listen to spiritual teachers or reading their books. Not only have they a lot of wisdom concerning the way out of suffering and the ego, but they also emanate an enlightened frequency. If you are aware enough you will feel their consciousness and so only through listening or reading you will move into the present moment. This may not open your Third Eye, but eventually will let you realize that the Third Eye is in fact only an illusion.