@turquoise-- Actually, many people prefer firm toothbrushes. But maybe because dentists recommend soft brushes, many stores have stopped selling firm brushes or have them in limited stock.
I've also been using a firm toothbrush for a long time. I agree that it's not best for people with sensitive gums. I don't have sensitive gums, so firm works best for me. I feel like the bristles get into the creases between teeth better.
I wish stores started stocking them regularly again. Last month, I actually had to order a toothbrush online. I don't know why everyone is acting like no one uses firm toothbrushes.