>>8518763I was just about to say that your need to condition your hair though is entirely dependent on how long your hair is, + how much oil your hair produces, how fine/thick your hair strands are.
But
What is 2-in-1 technology? Basically, two ingredients are added to a regular shampoo to provide a conditioning benefit - a silicone and a suspending agent. The silicone is usually an ingredient called Dimethicone and it is what makes the formula conditioning. The suspending agent is Glycol Distearate and it's what keeps the silicone from separating out of the formula. Without it, the silicone would just fall to the bottom of the shampoo and not stay mixed in). When the shampoo bottle is sitting on a shelf (or in your shower), the suspending agent is able to "hold" the silicone in the formula. However, when you put the shampoo on your head and mix it with water, the suspending agent does not work very well (which is a good thing!), so the silicone separates out and stays behind on your hair and provides conditioning.
Are there downsides to 2-in-1 shampoos? While it's certainly not true that 2-in-1s coat hair with wax or plastic, the silicone used can build up on hair over time (especially if you use lots of silicone-based hair products). Dimethicone works great for adding conditioning and shine, but it can also be heavy and build up a bit. All you have to do is use a silicone-free shampoo every so often to remove any potential buildup. Honestly, if you only use 2-in-1 shampoos then buildup is likely not to be a problem--it's usually silicone serums or other silicone-based styling products that are more likely to cause product buildup.