Masseter Muscle: Botox vs weight loss, which option would be the best way to slim them down?

Very good question. While I commend your weight loss efforts, it will probably not have much effect on your masseter muscles. These muscles tend to enlarge over time due to clenching or grinding the teeth. If you treat them with Botox, it will not only reduce the size of the muscle; it can also reduce tension in your jaw if you are experiencing that. 
Botox injections are performed in the office and typically take just a few minutes. The procedure is relatively comfortable and there is no downtime afterward. You should see the results develop in the two weeks following your procedure and they should last three to four months after that. Keep in mind you will need to repeat the treatment to maintain the positive results. Choose a doctor who is board certified and very experienced in Botox to ensure the best possible results. 

Thank you for your question.  Weight loss would only slim down the face.  Depending on the look you are going for, you may acquire your desired look by getting Botox to help with the contouring of your face.  It is always advisable to schedule a consultation with an experienced physician for optimal results.  All the best.

Weight loss will likely slim your overall facial appearance however it will not specifically slim the masseter muscle. Masseter muscle hypertrophy is caused by clenching or grinding of the teeth. Over time the muscle thickens as a result of this chronic muscle contraction. Botox can be very effective in lessening this muscle contraction which thins the muscle and creates a slimmer, more contoured jawline. I also recommend my patients consult a dentist for a nightguard since many patients clench their teeth at night.  Please consult a board certified dermatologist experienced in the treatment of masseter muscle hypertrophy. Best wishes.

Weight loss won't reduce muscle size. Only its inactivity will contribute to its reduction so wearing a nightguard to prevent grinding or clenching too much may help but Botox is the most effective short term method to reduce the thickness of the lower face if caused by masseter muscle hypertrophy (enlargement).The information provided in Dr. Shelton's answer is for educational purposes only and is not intended to constitute medical advice.  The information provided should not be relied upon as a substitute for consultations with a qualified health professional who may be familiar with your individual medical needs. 

I would not think that weight loss would have a significant impact on the size of the masseter muscles.  Weight loss can affect the appearance of the face though, through fat loss.  

Weight loss will not likely have a significant impact on the size of the masseter muscle.  Botox works  nicely to relax this muscle to slim the jawline.  Treatments are done every 3 to 4 months.  See an expert injector to learn more.

As your jaw does not store a lot of fat, dieting would not substantially reduce the size of your jaw.  Botox could work to help slim down the masseter muscle, but without an in-person consultation it is difficult to determine with any certainty.  I would recommend scheduling an in-person visit with an experienced provider to determine if Botox is the best next step for you. 

Great question! You would think that losing weight would slim the face, however if you have strong masseter muscles, this isn't the case. The masseter muscles can square off your facial appearance, making it look wider due to the prominence of the muscle. This muscle is often large due to clenching and grinding the teeth. Botox is a great treatment that will lessen the forces behind the clenching and grinding, and in turn slim and soften the appearance of the face. 

Generally, when losing weight your face may slim down, however, one cannot control which area to reduce. Any good personal trainer will tell you that it's difficult to spot reduce and that is especially true for the masseter muscles. Botox is an excellent way to relax those muscles and help contour the face.

Weight loss and dieting will not reduce the size of your masseter muscles. Weight loss may slim your face, but it will not change the masseters.