Termite Frass
This guy opened his kitchen cabinets one day to discover these tiny white dots. After cleaning it, he noticed they reappeared after a couple of days. We wouldn’t want to find any mysterious white substance in the cabinets where we store food (or really anywhere else in the house). So, he turned to the helpful people on the internet for some answers.
As many people pointed out, this was termite frass, and indeed a cause for concern. These white dots are waste of perforated wood created by termites. Reddit users suggested this person would call pest control asap, rather than cleaning this and trying to deal with the pest himself. We sure hope he took their advice to heart.