Botox for Face: How It Works, Results, How Long It Lasts and Side Effects

WHAT TO KNOW Botox treatment involves injecting a substance into certain facial muscles that will cause them to relax for a few months making the lines look softer. This treatment will help reduce lines caused by frowning, smiling or raising your eyebrows. It will not help fill any hollows or give volume. Changes may begin within 3–7 days, with the effect often becoming clearer over about two weeks. Botox usually lasts for around 3-4 months. Most side effects are minor and will resolve on their own. These can include redness, a small bruise or a headache. If you experience any difficulty with swallowing, talking or breathing or have a spreading weakness in your body you should visit the emergency department at once.

Most people asking about Botox will be worried about either their face looking stiff or feeling they will have to have it for the rest of their life. This is not usually the case as it depends on which muscles are treated and how much is used. You can stop having Botox whenever you like.

Botox is one of the most common non-surgical cosmetic treatments. A review of 65 trials involving over 18,000 people showed that it improved patient perceived facial appearance compared to a placebo (Fernandois Barrera et al., 2026). Some people consider treatment when expression lines become more noticeable, but age alone does not determine suitability.

What is Botox?

Botox is a trade name for a drug called botulinum toxin type A. It is also used to refer to the cosmetic treatments using similar products. Different botulinum toxin products have different dosing units and are not interchangeable.

Normally your nerves will signal your muscles to tell them to contract. Botox will block this signal to your muscle for a period of time. This will mean your muscles will not contract as much and you will not see as much folding in your skin when making expressions. After a few months your nerve will start to send the signal again and your muscle will slowly start to function as normal.

Botox will not add any volume to your face. This means it cannot help fill any hollows under your eyes or give volume to your cheeks. Dermal fillers may be considered for some volume-related concerns but are not suitable for every area or person.

What Can Botox for Face Treat?

Botox for the face is mainly used to help reduce lines on the upper part of your face. Below is a table showing the common areas and what you may notice.

Area	What You May Notice
Forehead	Straight lines on your forehead when raising your eyebrows
Frown lines	11 lines between your eyebrows when angry or concentrating
Crow’s feet	Lines on the outside of your eyes when smiling or squinting
Lines that you can see even when you are not making expressions	Botox may help reduce these lines but if you have deep lines you may need another treatment.

Lines which only appear when you make expressions are known as dynamic wrinkles and will respond best to Botox. Lines that can be seen even when your face is relaxed are known as static wrinkles and may only improve slightly with Botox alone.

What Happens During a Botox Appointment?

Below are the steps you will usually go through on the day of your treatment.

• Your doctor will ask you which lines you are concerned about, what expressions you would like to keep and if you are on any medication or have had previous treatments. Before proceeding, ask which product will be used, who will inject it and how an unwanted result would be managed.
• You will be asked to frown, smile and raise your eyebrows so your doctor can see how your muscles move.
• Your skin will be cleansed and small amounts of Botox will be injected into your intended muscles using a very fine needle.
• You may feel a slight pinch or tingle. You may also see some small lumps.
• You will be given advice on what to avoid for the next few hours and when to come back for a review.

The injections will take around 10-15 minutes. You can return to work the same day.

When Will I See Results Of Botox Treatment?

Botox will not work straight away. Below is a table showing when you may notice results.

Time After Botox	What You May Notice
First 2 Days	You may not notice a change yet. Small bumps or redness can occur.
3-7 Days	You may start to feel your muscles are slightly weaker and lines are starting to soften.
2 Weeks	The effect is often clearer by this point. Your doctor can review your results.
3-4 Months	Your muscles will start to move again. Lines will start to appear.

Do not check in the mirror the next day to see if it has worked. In the first week one side may start to work faster than the other which is usually normal. However if anything looks odd after 2 weeks you should show your doctor.

How Long Does Botox Last?

Botox for facial lines will usually last around 3-4 months. Some people may find it lasts a little longer (AAD, n.d.). This does not happen overnight. Your muscles will start to move more and your lines will start to reappear.

The length of time will depend on the product used, dose, muscles treated and your body. You do not have to keep having Botox. Some people will come back when their muscles start to move again. Some people will have it occasionally or stop completely. If you stop, Botox itself does not generally make lines worse, although your skin continues to change with age.

Botox Side Effects

Most side effects are minor and will go away. You may notice some redness, slight swelling, a small bruise or soreness in the area you were injected. Some people will also get a headache.

A review of 24 studies involving over 4000 Botox sessions showed most side effects were minor and short lived (Zargaran et al., 2022). Occasionally Botox can cause a nearby muscle to become weaker. This can cause a drooping eyelid or eyebrow or asymmetry. This usually improves as the Botox wears off. Below is a table showing what is normal and when to contact your doctor.

What You May Notice	Usually Means
Small lumps or redness at injection site	Normal. Will go away in a few hours.
Small bruise or soreness	Normal. Will go away in a few days.
Mild headache	Usually normal.
Increasing redness or pain daily	Contact your doctor.
Drooping eyelid or eyebrow	Contact your doctor.
Difficulty swallowing, talking or breathing	Visit the emergency department at once.

Very rarely Botox can affect areas outside of the injection site. This can happen a few hours to a few weeks after your injection (AbbVie, 2024).

Who Should Not Have Botox?

Below are some situations where Botox is usually avoided or delayed. These are general points and your doctor may adjust them depending on your situation.

• Infection in the area you are having Botox.
• Pregnancy or breastfeeding.
• Muscle or nerve conditions such as myasthenia gravis.
• A previous allergy to Botox or any of its ingredients.

Make sure to let your doctor know what medications you are on. Some antibiotics or muscle relaxants can affect how Botox works. Blood thinners can cause increased bruising. Never stop any prescribed medication without consulting your doctor.

Can Botox Look Natural?

A natural-looking result may be possible with careful assessment and dosing, but it cannot be guaranteed. The forehead muscle helps lift your eyebrows so if too much Botox is used you may feel your eyebrows are heavy or sagging slightly.

Therefore it is not always a good idea to ask for a completely smooth forehead. Some people will want to soften their frown lines but still have expressions. Others will want a smoother look. Your doctor will plan the correct dose to take this into account.

Dermatologist’s Perspective “Patients usually point at a line on their forehead and ask me to remove it, but what I always tell them is that the same line can come from very different muscle activity. At Ageology we ask the patient to frown, smile and raise the eyebrows to see which muscle is making the line and whether it is also holding up the eyebrow, because weakening it too much can make the brow look heavy. Sometimes the line is already deep at rest and Botox alone will give only a small change, so it is better to know this before the treatment.” Dr Sukhsagar Ratol, MBBS, MD Founder & Director, Ageology Skin Clinic, Reg. No. 32252

Botox vs Dermal Fillers

Botox and fillers are often mentioned together but they are very different. Below is a table showing the differences.

Point	Botox	Dermal Fillers
How it works	Relaxes muscle	Adds volume under skin
Used For	Lines from expressions	Hollows, volume loss and shaping
Duration	Around 3-4 months	Usually 6-12 months or longer depending on the filler.

For example Botox can soften your frown line from concentrating but cannot fill your hollow under your eyes. Fillers may be considered for suitable hollow areas, but cannot relax muscles.

Getting Botox at Ageology

At Ageology we will only carry out Botox treatment after assessing your facial movement, lines you want to soften and expressions you want to keep. We will talk through what product we will be using, areas we will be treating, possible side effects and cost.

Frequently Asked Questions

Is Botox painful?

Only a slight pinch or tingle as the needle is very fine. Most people will not need a numbing cream.

How long until Botox works?

Changes often begin within 3–7 days, with results becoming clearer over about two weeks.

How long does Botox last?

Usually 3-4 months for facial lines. Length will depend on product, dose and your body.

Will my face look stiff?

Not necessarily. Careful assessment and dosing may help preserve expressions, but unwanted changes in movement can still happen.

What happens if I stop having Botox?

Your muscles will slowly start to move as they did before. Your lines may reappear as the effect fades, while natural ageing continues.

Can I go to work?

Yes most people will go back to work the same day. Avoid rubbing the area and follow your doctor’s aftercare advice.

What age can I start Botox?

There is no single age to begin Botox. Suitability depends on the concern, medical history and a clinical assessment.

References

AbbVie Inc. (2024) BOTOX Cosmetic (onabotulinumtoxinA) for Injection. Full Prescribing Information. Revised October 2024. 

American Academy of Dermatology Association (n.d.) Botulinum toxin therapy FAQs. 

Fernandois Barrera, V.A.J., Maldonado Rodriguez, K.A., Chaple-Gil, A., Basualdo Allende, J. and Fernández Godoy, E.M. (2026) ‘Patient-Reported Aesthetic Outcomes of Botulinum Toxin Type A: A Systematic Review and Meta-Analysis of Placebo-Controlled Randomized Trials’, Aesthetic Surgery Journal.

Indian Association of Dermatologists, Venereologists and Leprologists (IADVL) (n.d.) Botox. 

Zargaran, D., Zoller, F., Zargaran, A., Rahman, E., Woollard, A., Weyrich, T. and Mosahebi, A. (2022) ‘Complications of Cosmetic Botulinum Toxin A Injections to the Upper Face: A Systematic Review and Meta-Analysis’, Aesthetic Surgery Journal, 42(5), pp. NP327–NP336..