I floss every day, and I don't bleed, but then when the hygienist does it, I bleed a little. I am doing every tip they have given me to improve my form, but it still happens some. Any tips from internet strangers?

My best theory is that the hygienist is rougher on my gums than I am (they let the floss snap down onto my gums hard enough that it hurts) but I'm not certain enough to challenge their technique to their face.

It's been several decades, about 20 different dentists, and I've tried everything they've advised, plus everything I can find. Different floss, salt rinse, different mouthwashes, toothpastes, brushing techniques, etc.

I still bleed.

It's my opinion dentists (like most doctors) suffer from dogmatism.

If flossing was the only relevant element, my gum bleeding would've changed over the decades - it hasn't.