A Guide to Facial Filler: Products, Process, Aftercare 2011.08.01

Published 2011.08.01 · Updated 2026.10.28

What to Know Before Getting Filler: Product Types, Treatment Areas and Aftercare from Dr. Wontak Choi

As filler has become common, many people treat it as a simple procedure. In an article from the Korean outlet Nocut Health, Dr. Wontak Choi, representative director of Yaan Clinic in Gangnam, Seoul, explained that results depend on the doctor’s understanding of skin structure and on the product chosen. The article covers where filler can be used, how the session runs, and what to do afterward.

All treatments at Yaan Clinic are performed by a skilled, specialized medical team, delivering standardized, high-quality care based on the clinic's own proven clinical protocols.

Treatment areas and process

According to the article, filler adds volume to a low nose bridge, a sunken forehead or a recessed chin, and softens deep forehead lines and nasolabial folds. It can also be used for fine lines around the eyes, under-eye hollows, sunken cheeks, the breasts and the hips. The report notes growing interest from men as well as women, and describes filler as an option for people who want a change without surgery.

A session starts with numbing cream or, depending on the area, an anesthetic injection for about 30 minutes. The filler is then injected and the area is molded to the intended shape.

Product types and aftercare

Dr. Choi named two main material groups: hyaluronic acid fillers such as Restylane and Juvederm, and calcium hydroxylapatite fillers such as Radiesse. The article describes Restylane as natural-looking, and Radiesse as slightly firmer, with a crisper shape and a longer duration. For aftercare, he advised avoiding rubbing the treated area, strenuous exercise, and exposure to strong heat or cold such as saunas or sunbathing for a while.

His main advice was to confirm that the product is genuine and approved by the US FDA, and to check the amount used, at a clinic that performs filler as a specialty.

Yaan Clinic, Gangnam, Seoul

Operating Hours

• Mon / Fri: 10:00 am – 9:00 pm (Evening hours)
• Tue / Wed / Thu: 10:00 am – 7:00 pm
• Sat: 10:00 am – 4:00 pm
• Sun / Public Holidays: Closed
• Lunch Break: 1:00 pm – 2:00 pm

Appointment Inquiries

• Phone: +82 10 5308 0499
• Address: 5, Deokbong Building, 82-gil Bongeunsa-ro, Gangnam-gu, Seoul
• Email: yaan09@naver.com