u/Legal_Strain9190

I’ve had thick, dense hair all my life, but over the last few months I’ve noticed a drastic decrease in hair thickness/density along with increased hairfall.
I also have dandruff and recently started using Scalpe Plus shampoo. I use a mild shampoo on other days.
What should I change or look out for? Could dandruff be causing this, or should I see a dermatologist?
Any advice/experiences would be appreciated.