Why I Often Combine Botulinum Toxin and HA Fillers in the Same Session (and Why Less Is Usually More)

Why fillers alone are often overused

In recent years, injectable treatments have become increasingly volume-driven. Patients are frequently told they “need more filler” - more syringes, more sessions, more top-ups.

What is often overlooked is this: many facial aesthetic concerns are not primarily problems of volume loss, but of muscle activity and imbalance.

As a plastic surgeon, I think first in terms of anatomy and mechanics, not product.

The face is not static

The face is a dynamic structure. Muscle pull, resting tone, and the direction of movement all influence how the face ages, and how fillers behave after injection.

When excessive muscle activity is not addressed, fillers may migrate or appear bulky, accentuate heaviness rather than lift, require progressively larger volumes over time, or create stiffness instead of refinement.

In these situations, adding more filler is rarely the answer.

Why combining botulinum toxin and HA fillers makes sense

When used thoughtfully, botulinum toxin and fillers address different problems. Botulinum toxin modulates muscle pull, tone, and downward vectors. Fillers restore or enhance structure, projection, and contour.

By adjusting muscle forces first, or at the same sitting, fillers can be placed more precisely and more conservatively. In many cases, this actually allows better results with less filler, rather than more.

Common examples from my practice

While individual treatment plans always vary, certain patterns come up repeatedly.

1. Nasolabial folds

   Prominent folds are often worsened by overactive depressors of the lower face. In selected patients, addressing muscle activity while providing structural support to the cheek first, followed by targeted support at the pyriform fossa or Ristow’s space, allows improved contour with far less filler required.

   
   

2. Chin and lower face balance

   Chin augmentation alone can look heavy if the mentalis and depressor muscles are untreated. Combining targeted botulinum toxin with structural chin filler often produces a cleaner, more stable and harmonious result.

   
   

3. Perioral ageing

   Fine lines and lip imbalance are frequently driven by orbicularis oris activity. Small, judicious doses of botulinum toxin can improve the surrounding environment including enabling a subtle lip flip where appropriate, so that lip filler results remain soft, natural, and not “ducky”.

This is not about doing more - it’s about doing less, better

Combining treatments does not mean over-treatment. In fact, the goal is usually the opposite: fewer syringes, clearer anatomical logic, and results that last longer and look more natural.

This approach comes from surgical thinking through understanding vectors, balance, and structure, rather than blindly chasing volume.

A note on philosophy

I do not believe in one-size-fits-all, templated injectable plans. Nor do I believe in treating faces as a shopping lists of syringes.

Every consultation begins with a full facial assessment, including both static and dynamic analysis, muscle balance, skeletal support, and the patient’s priorities. Just as importantly, it includes restraint because the risks of fillers, including vascular compromise and visual loss, are well recognised and should be humbling enough for any serious practitioner.

Sometimes fillers alone are appropriate. Sometimes botulinum toxin alone is enough. And sometimes, a carefully combined approach makes the most sense, both aesthetically and safety-wise.

Final thoughts

Injectables are tools, not solutions in themselves.

Used thoughtfully, botulinum toxin and fillers can complement each other to produce results that are more refined, more stable, and more respectful of one's facial anatomy.

Often, the most aesthetic outcome comes not from adding more, but from understanding when to stop.

Written by Dr Ng Zhi Yang, Singapore Plastic Surgeon