@
kandake
1) when straightening hair they cause bends in the strand
*mainly a cosmetic issue
2) they put stress on the strand and often break off and leave a split end
ETA: this is a microscope image of how the tension of the knot can split the strand
3) They can cause more tangles and knots. If you have a ssk it may get caught in a newly forming ssk loop and the two hairs can lock together like legos
(^this is from personal experience) finger detangling has opened my eyes to the reasons why my tangles exsits. Now more often than not, I can remove any tangle without breakage. If I see a ssk loop forming I take a saftey pin or needle and remove it, but if the knot is formed I clip it with my shears
now that I eliminate splits and ssk's often detangling is a breeze. I spent about 15mins detangle on my entire head and I am between APL and BSL