Immune system

I've been suffering with bleeding gums coinciding with increased hairloss. My dentist asked me if I was on steroids because he said they weaken your immune system causing bleeding gums. I told him I didnt take steroids and said "So my gums are bleeding because my immune system is weak" and he said "no". I'm there thinking hang on you just said that was exactly the reason *sigh*. I told him I was using hydrogen peroxide and he said that would make things worse but I told him it'd actually improved things then he got angry and said "well my recommendation is not to use it" and advised me to use cordysol which he said stains teeth brown *sigh again*