I had dense hairs on my chin and we're starting to see a real difference lately, but it has been a journey. I've seen my electrologist every week for just over a year, with 10 weeks missed due to surgeries (both mine and my electrologist's). Each of my sessions has been an hour.
That's what it takes. Stubborn, dense, deeply-rooted chin hairs require multiple "clearances." You have to keep going back.
That was the most dense area of growth on my face but I still have thousands of hairs on my lower cheeks and my neck. I expect it will be at least 3-4 more years of weekly visits before we can taper off to shorter and/or less frequent sessions. Eventually, we'll get to a maintenance level, where I'll see her on occasion as pesky hairs pop up.
I'm in school to become a licensed electrologist and I've learned a few things:
1. It's necessary to destroy the entire hair root structure and all cells responsible for reproduction or the hairs will regenerate
2. The anagen (growth) phase is the ideal time to treat hairs, but many of the hairs treated won't be in that phase, so treatment is less effective and re-treatment will be required. There's no way for your electrologist to look at your hairs and determine what phase of growth they're in. They have to remove them first. Sticking to the schedule established by your electrologist is the best way to maximize treatment effectiveness.
3. Laser is effective and is the way to go if you have darker hairs/lighter skin but paradoxical hypertrichosis is a real thing, so it's something to be aware of. The laser can stimulate hair growth and make hairs stronger, so your laser tech needs to know what they're doing in order to minimize the possibility of that happening.
4. Faster treatment (more hairs removed per hour) doesn't mean better results. The quality of the treatment is most important. A good electrologist will "zap" the bulb, bulge and papilla and will often remove a juicy hair that has been destroyed properly. In some cases, galvanic or blend modalities are required. They take longer but can be more effective.
5. Don't pluck! Plucking and epilation often causes hairs to grow back stronger and it usually deforms the roots, which makes subsequent electrolysis treatment less effective.