Did anyone use this before?

I have personally never heard of this practice before so I did some research on pine tree essence. Here is what one source says about it:

Pine Tree Essence:

This is a master healer that works on every level within you, physically, mentally, emotionally and spiritually; it has a major effect in stimulating change within you, supporting enhanced strength and endurance to deal with your issues; it helps you open your third eye and strengthen your ability to deal with your many gifts; it helps to release the stresses within you so that you can feel more comfortable and safe living on Mother Earth; it`s a powerful eliminator of invaders including parasites, worms, viruses, infectious bacteria, fungus, candida, and mould; it washes out metal, chemical and atomic poisons; it cleanses out toxins giving you a very deep detoxification; it rebalances systems helping them work more effectively; it helps you see people places and things more clearly, as they truly are and not as you want them to be.

I found the comments on cleansing to be most relavent to your question. Perhaps it does help to cleanse and stimulate the scalp.

Hope this helps. :)