How do you manage hair that breaks off a lot?

I usually comb my hair thoroughly before washing it when it's dry, and I use hair products every day to manage it. This time, when I combed my hair, it was really tangled, and I was surprised to see hairs breaking off in the middle and falling out in bunches. ^^; I haven't used a curling iron recently, but I did blow-dry my hair as usual.

My hair product was originally a good fit, but should I change it to one with more protein or moisture?

Do you know any good products or methods for maintenance?