They say I need to use dental floss.

My dentist told me that brushing alone isn't enough. I really do tend to skip it because it's a hassle. I always make sure to use an interdental brush, and I feel much more refreshed if I use dental floss afterward. I feel like the gaps between my teeth are widening over time, so I'm worried they might get even bigger, but I heard that if I don't brush properly, food particles just build up and it's bad. It seems like brushing habits are really important.