Here is Friday's food for thought! Trimming could allow your hair to attain a longer length. It sounds strange but what my fellow lab rats discovered is that hair will grow until it reaches a critical length when it appears to grow slowly or not at all (Journal of the Society of Cosmetic Chemists, pg 155-75, 1978.).
To understand why this happens, I will start by explaining why hair starts to taper (meaning the strand becomes thinner as it gets farther away from the scalp). Simply put, the cuticle wears away. Remember that the cuticle is not just one layer, it has several layers to it (jog your memory by clicking here).
As the hair grows from scalp to tip, the damage to the cuticle increases because the hair at the tip is older and has been subjected to more torture (combing,wetting, drying, roller setting, heat setting........etc).
Cutting the tip of the hair off may be an excellent way to possibly trigger a new longer length. I will leave the lengthy explanation for Monday and leave you with this diagram to digest during the weekend!! Happy Friday all!!