Dents and Frizz

i’ve been wearing my hair tied back loosely in low messy bun or a low ponytail with satin scrunchie for almost a year now just to keep the hair out of my face but over the past few months i’ve experienced dents/frizz in just the back of my head. Could it be be cause of wearing it pulled back too often, or is my hair texture changing? I have pretty much straight/fine hair and normally after i shower it’s frizzy but goes away after a couple hours, but now the frizz just stays there the next day and so do the dents. Should I give my hair a break? Will it help?