I only had 15 units per side 4 wks ago & it "worked" far too well! My doc says it'll wear off in 3-6 months, many Realself docs have stated 4-6, but I've heard reports that botox for jaw reshaping lasts way longer than in the forehead, i.e. 9-12 months! Some even say it's permanent (!!!) Going by averages, how long will it be before jaw botox actually begins to expire, and from there, when can one expect to be back to their pre-botoxed state - if ever!? :S
How Long Does Botox in the Masseter Muscle/jawline Really Last?
Doctor Answers 13
Botox in the masseter area
How long botox treatments "last" in the masseter depends on a number of factors. One factor is if you are using a guard in your mouth to prevent grinding or clenching. The guards prevent the muscles from working very hard, so the muscles do not regain their former strength. I personally have had 50 units in each masseter for clenching, and wear a guard, and the muscle is reduced and soft over 9 months later.
If you are not using a guard, and did the Botox more for cosmetic treatment in the jawline area, nothing stops your muscles from gaining strength back, and the duration of action will likely be less than 6 months. 15 units is a very small amount if you had a thick masseter muscle. I would bet you'll start to see increased thickness about 3-4 months after treatment without the mouth guard.
Hope that helps!
Madeline Krauss, M.D.
Botox Effect on Masseter Muscle Depends on Dose Given
As stated above, the longevity of the effect of Masseter muscle weakness after Botox injections, depends on a number of factors, the most important of which is the dose administered. Typically, for lower face shaping, we use up to 30 units per side, which is twice what you received. The effect generally lasts for 9-12 months. In your case, I would expect return of masseter strength and thickness within 6 months. If you are interested in reversing the effect of Botox in ANY anatomic area, one way to hasten this is to USE the muscles involved. The Botox effect appears to wear off faster, the more the muscle is used. In the case of Masseter muscles, you can do an "exercise" in which you clamp down your teeth hard, 10 times in a row, several times during the day, to more quickly reverse the Botox effect.
Sheldon Pollack, MD, FRCPC
Medical Director, Toronto Cosmetic Skin Surgery Centre, Inc.
Botox, Wrinkle Treatment, Beverly Hills Botox, Los Angeles Botox
Because you're using the Botox in a larger muscle (the Masseter), which continues to contract everytime you chew or open/close the mouth...the effects of the Botox may not last as long as when it's injected into the forehead where you can go without using the muscles. I like to do a full dose booster Botox treatment 1 month after the initial Botox treatment as a way to further weaken the targeted muscle(s).
For the Masseter, I typically use an increased Botox dose, have the patient return in 1 month for a booster Botox treatment and then continue treatments at 4-6 month intervals until the desired effect is achieved. Remember, the larger the Masseter, the more Botox is required to significantly weaken it.
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Duration of Botox in the masseter muscles
Botox in masseter lasts 3-6 months, depending on dose
You will notice that your ability to clench your teeth returns first, and then the masseter will grow back again. If this is your first treatment, your face should return fully to its original shape.
Botox masseter injections duration
Depends on your body
Botox should wear off in 4 months
On average, the botox effect will wear off in four months. it will not be permanent. jaw shaping and masseter muscle will not be permanently affected by botox injections.
These answers are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.