Why are Botox injections needed for enlarged Masseter muscles?

If you don't chew or grind for a long time, then it is possible that your muscles could relax, making them less prominent. But does that mean you'll be eating a liquid diet, then? We use our masseter muscles everyday to eat and perform other things that we do on a daily basis. That's why it would be very, very difficult to allow these muscles to reduce in size on their own.

When
you do not use your muscles, they begin to relax and become smaller, a term
called atrophy. It is likely that your masseter muscles may reduce in size if
you were to decrease excessive chewing, like with gum. However, as you require
your masseter muscles for chewing food, it is not possible to completely reduce
the size on your own without Botox. Botox
injections for Masseter reduction is extremely effective, in that it relaxes
the muscles so that they decrease in size, but still allows you to chew, and
you do not have to worry. I would still recommend decreasing gum chewing, as it
would help to prolong the effectiveness of your treatment.

Botox is an effective treatment option for people trying to
overcome bruxism, or teeth grinding, a habit that causes enlarged masseter
muscles. When overactive jaw muscles continuously clench overnight and cause
the teeth to grind, the masseter muscle becomes hard and enlarged from constant
activity. Botox works by relaxing and softening the overdeveloped muscle. This
not only helps alleviate teeth grinding, but also slims down the appearance of
the jawline. Botox treatments for the masseter muscle can last up to 3-4
months.

Botox treatment can help decrease the size of the muscle, which is typically genetic.  I haven't seen a patient yet from excessive chewing that has increased the size of this muscle.  The chewing and size of the muscle will improve with repeated injections which will also help the appearance of your jawline.  I wish you the best of luck, Dr. Emer.

You could try to decrease a chewing habit. If successful, it may slowly work to some extent. If not use Botox. Best wishes, Maurice Vick

It is very difficult to stop habits, especially if grinding of the teeth occurs at night.  For an individual who has large masseter muscles giving the jawline a square appearance, the slimming effect caused by Botox injections is appreciated.

Botox into the masseter muscle will help to thin the muscle and slow or stop your excessive chewing. In Asians we give usually between 20-30 units each side to flatten the muscle. You should have the same dose.

Botox injection is an excellent way to reduce masseter muscle mass thereby giving a more feminine triangular appearance to an otherwise square masculine jawline. While reducing excessive chewing can reduce muscle bulk, it won't produce the same dramatic result as Botox injection.

If a patient can control their teeth grinding and/or excessive chewing, the muscle will certainly shrink on its own (although it may take many months). Botox works well for people who have a hard time controlling their chewing/grinding. In addition, there are people who genetically have a larger masseter muscle, which can give a more masculine, square appearance to the face. This is seen in some Asians patients for example, which explains the incredible popularity of Botox injections in the masseter in these countries. 

Masseter muscle hypertrophy is genetic.  It is unlikely do to excessive chewing.  Botox has to be done repeatedly for someone to see the effect.  Many patients think it is a one time treatment and it is not.