It isn't predictable, though. I find that since I started wearing mine, my canals are less itchy and make less wax. I feared both would be worse, but I'm pleasantly surprised.
The recommendation is to change wax guards and tips weekly. I find that twice a month is plenty, and even then it seems almost a waste at times. They look clean but I still dutifully change them.
We must have different hearing aids. What's a wax guard and tip? I don't have ANY any wax in my ears so that's why my ear canals itch. My aids have have soft ear canal inserts called domes. They're easy to keep clean with the small brush that comes with them. They were never uncomfortable and Costco will replace them every 2 months and test the hearing aids to see if their still functioning like they're supposed to. A friend got his hearing aids a year before I did and got the ones with the hard plastic ear canal inserts that bothered him for while.
