How Long Does Masseter Botox Last?

By Pinch Med Spa Staff

October 16, 2023

Botox for masseters, also known as jaw reduction or masseter reduction, is a popular treatment for those looking to achieve a slimmer jawline and reduce symptoms of teeth grinding or TMJ disorder. But how long do the results of Botox for masseters last? In this post, we'll explore the longevity of Botox for masseters, the factors that influence its duration, and how you can maintain your results.

Understanding Masseter Botox

What Is Masseter Botox?

The masseter muscles are the prominent muscles located at the angle of your jaw that are responsible for chewing and clenching. Enlarged masseter muscles can lead to a square-shaped jawline, which some people may find aesthetically undesirable. Botox injections can help relax these muscles, resulting in a softer, more tapered jawline and relief from clenching and grinding.

Causes of Enlarged Masseter Muscles

Enlarged masseter muscles can be caused by genetic factors, habitual teeth grinding (bruxism), or excessive chewing. This condition can contribute to a bulky jawline and can also cause discomfort or pain in the jaw area.

How Botox for Masseters Works

Mechanism of Action

Botox, a neurotoxin derived from Clostridium botulinum, works by temporarily paralyzing the muscles it is injected into. When injected into the masseter muscles, Botox relaxes these muscles, reducing their size and activity. This results in a slimmer jawline and can also alleviate symptoms of bruxism and TMJ disorder.

Treatment Procedure

The injection process for masseter Botox is quick and minimally invasive. Your provider will use a fine needle to inject Botox into specific points in the masseter muscles. The entire procedure typically takes just a few minutes and is relatively painless.

Longevity of Botox for Masseters

Typical Duration of Results

The effects of Botox for masseters typically last between 4 to 6 months. However, the exact duration can vary from person to person based on several factors, including individual response to the treatment and lifestyle habits.

Factors Influencing Longevity

  1. Metabolism: Individuals with faster metabolisms may find that Botox wears off more quickly.
  2. Muscle Activity: Frequent use of the masseter muscles can cause the effects of Botox to wear off sooner.
  3. Dosage: The number of units injected can influence how long the results last. Higher doses may provide longer-lasting effects.
  4. Injection Technique: The skill and technique of the injector play a significant role in the duration of results.

Maximizing the Longevity of Your Results

Follow Post-Treatment Instructions

Following your provider’s post-treatment care instructions is crucial for maximizing the longevity of your Botox results. This may include avoiding strenuous activity, not rubbing the treated area, and staying upright for a few hours after the injection.

Maintain a Consistent Treatment Schedule

Scheduling regular Botox treatments every 4 to 6 months can help maintain your results and prevent the return of a bulky jawline or symptoms of bruxism. Over time, consistent treatments can even lead to longer-lasting effects as the muscle becomes conditioned to remain relaxed.

Healthy Lifestyle Choices

Adopting healthy lifestyle habits can also contribute to longer-lasting Botox results. These include:

  • Avoiding Excessive Chewing: Limiting activities that overwork the masseter muscles, such as chewing gum or tough foods, can help maintain results.
  • Stress Management: Reducing stress can decrease habits like teeth grinding, which contributes to masseter hypertrophy.
  • Proper Oral Care: Using night guards or other dental devices as recommended by your dentist can help manage bruxism.

Use of Complementary Treatments

Combining Botox with other treatments can enhance and prolong your results. For instance, using dental devices to manage bruxism or other cosmetic treatments for overall facial aesthetics can complement the effects of Botox.

What to Expect Post-Treatment

Immediate Effects

Immediately after the injection, you might experience slight redness, swelling, or bruising at the injection sites. These side effects are usually mild and subside within a few days.

When to See Results

You can expect to see initial results from your Botox treatment within 1 to 2 weeks, with full results visible in about 4 to 6 weeks. The treated area will appear slimmer, and symptoms of bruxism may be significantly reduced.

Follow-Up Appointments

Scheduling follow-up appointments as recommended by your practitioner is essential for maintaining optimal results. These appointments allow your provider to assess the effectiveness of the treatment and make any necessary adjustments.

Is Botox for Masseters Right for You?


Botox is a safe and effective treatment for most people looking to reduce the size of their masseter muscles and achieve a slimmer jawline. However, it’s important to have a thorough consultation with a qualified provider to ensure it’s the right option for you, especially if you have any underlying health conditions or are taking certain medications.


During your consultation, your provider will evaluate your facial anatomy, discuss your aesthetic goals, and determine the appropriate number of Botox units for your specific needs. This is also a good time to address any concerns or questions you may have about the procedure.

Next Steps

If an enlarged jawline or bruxism is a concern for you, Botox can be a quick and effective solution to achieve a more balanced facial appearance and relief from symptoms. For a convenient and professional at-home experience, consider booking a Pinch Med Spa appointment. Our nurse practitioners will visit your home, ensuring you receive the best care in a comfortable setting for your masseter Botox treatment.

For more information and to book an appointment, visit our masseter Botox treatment page.

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