My electrologist is using thermolysis to remove my beard. Though she also knows & can do blend, she prefers thermolysis and does a great job clearing whatever area we're working on that day. A few weeks ago I gave permission for an electrology student to observe my session. It was really interesting since I got to hear my lady explaining the process & technique repeatedly. I did wince a tiny bit when instead of saying to the student, "With your transgender clients...," she said, "With the transgenders...." Apparently, I have an opportunity for a bit of education with her, lol. Otherwise, I've always found her to be entirely respectful.
From what I've learned - if the follicle is truly destroyed, the hair will not regrow. Sometimes, follicles are only partially destroyed so in those cases regrowth is possible. Especially with hairs that have been repeatedly tweezed, the follicle root can distort over time and sort of bends at its base. Since the needle insertion is straight & doesn't bend (ouch! THAT would hurt, huh?) those follicles can be tricky and don't always get destroyed the first time.
Sometimes you're going to feel a tug after a follicle is zapped. That means the follicle hasn't fully been destroyed. When that happens during my sessions, my electrologist doesn't keep tugging at it - she zaps that follicle again, up to two more times. If it's properly destroyed, the hair will slip out of the follicle without tugging, often with its whitish sheath. The ones that come out easily with the whitish sheath are the ones she says are definitely destroyed.
Being well hydrated apparently really helps with electrolysis, and also can help dial down the discomfort. She always tells me I'm easy & fast to work on because of my good hydration. My decent pain threshold & occasional use of a numbing gel also play a role, certainly. I generally do a weekly 45 minute session. After roughly eight months my neck & sideburns are generally clear with some occasional very sparse new growth; still working on my jawline, upper lip & chin.
Probably the hardest thing for me now is allowing my remaining beard to grow to a good length for a session; since starting HRT in August its growth has really slowed. When I started with her, three day's growth was enough. Now I have to stop shaving by Sunday for a Friday appointment. That's also because my beard is mostly white, and she needs a little extra length to be able to see them well. I will be SO GLAD when I'm through the bulk of my electrolysis.