About Masseter Botox | Jawline Slimming

Jawline slimmining is referred to by many names, including masseter botox, jawline botox, masseter slimming, masseter reduction, and teeth griding treatment for bruxism. Jawline slimming uses botulinum toxin injection to relax the masseter muscles that causes square jaw, which often deemed as masculine. Jawline slimmming injection helps to relax and reduce the size of the masseter/jaw muscle, which will result in a slimmer look and sharper facial features. This is a popular procedures to help many men and women to achieve an ideal v-shaped or oval-shaped face, which could not be achieved by face-slimming or jawline exercises. The results of jawline slimming takes about 3-4 weeks to manifest and lasts for 4-6 months. To maintain the best results from the treatment, you can repeat the treatment every 4 to 6 months. Apart from injecting botox to the masseter to create a more visivle jawline, another treatment, jawline fillers, is a popular treatment in conjuction with jawline slimming.


Botox (Allergan)

Bocouture (Merz)

Best Practices


  • Avoid alchohol 24 hours before treatment
  • Avoid having botox treatment during menstruation period
  • Please inform the practitioner if you have injected botulinum toxin within 3 months
  • Please inform the practitioner you have done Thermage or Ultherapy within the past three months
  • Do not wear any make up on the day of injection
  • Do not take aspirin, aminoglycoside antibiotics (such as gentamicin, kanamycin) within 2 weeks before injection of botulinum toxin
  • To limit sun exposure on the day of treatment, we recommend bringing a cap/hat and a pair of sunglasses. please bring a hat and sunglasses


  • Do not drink alcohol within 24 hours, and avoid spicy food, shelled seafood and beef
  • No strenuous exercise for 24 hours
  •  You can wash your face and take a bath on the same day
  • Do not apply skin care products to the needle eye within 24 hours, and do not rub the injection site


  • 2-3 days to start to have effect, Botox effect can last 3-6 months
  • Stove legs and shoulders: the best effect is one month

Follow-up visit

  • 2-3 weeks follow-up consultation
  • No follow-up consultation after the time

Who is suitable for Face Slimming Treatment?

 Male or female who wants to reduce size of jaw for a sharper and more defined jaw line.

You are not a suitable candidate for Toxin Treatment if you:

  • Are pregnant or breastfeeding
  • Have untreated epilepsy or porphyria
  • Tend to develop hypertrophic scarring
  • Are hypersensitivity to hyaluronic acid and/or to gram-positive bacterial proteins
  • Are hypersensitivity to lidocaine or to amide-type local anaesthetics, the product constituents or excipients
  • Have areas presenting cutaneous
  • Have active autoimmune disease
  • Have a history of anaphylactic shock 
  • Have acute rheumatic fever with heart complications
  • Are currently taking drugs that reduce or inhibit hepatic metabolism, such as cimetidine and beta-blockers
  • Have been treated with a permanent implant in the proposed treatment area

You will require a consultation with your respective doctor at Yuchi Medical before having a Toxin Treatment if you:

  • Have inflammatory and/or infectious process (acne, herpes, etc.)
  • Are currently undergoing laser, deep chemical peels or dermabrasion
  • Suffer from, or have a history of, autoimmune disease or autoimmune deficiency
  • Are undergoing immunosuppressive therapy
  • Have severe and/or multiple allergies
  • Are showing symptoms of cardiac conduction disorders
  • Have a history of streptococcal disease
  • Have body dysmorphic disorder
  • Have abnormally thin skin or skin atrophy
  • Patients on anti-coagulation medication or using substances that can prolong bleeding

About Botox

Botulinum Toxin A (more commonly known as Botox) is the protein complex derived from the bacteria Clostridium Botulinum. Currently, there are quite a few types of Botulinum Toxin in use by practitioners all over the world. At Yuchi Medical, our primary choices of Botulinum Toxin are Bocouture and Botox.

Botox blocks signals from the nerves to the muscles. It interferes with the nerve stimulation of the muscles causing excess facial expressions. This relaxes the muscles in the injected part, helping to smooth out your skin and prevent wrinkle formation.

When Botox is appropriately used by a suitable qualitied practitioner, it is safe and has few side effects.

  • Forehead Lines
  • Frown Lines
  • Neck Lines
  • Crow’s feet
  • Lower-eyelid wrinkles
  • Eyebrow Lift
  • Square Jaw Reduction (Face Slimming)
  • Dimpled Chin
  • Bunny Lines
  • Sweaty Armpits and Palms (Hyperhidrosis)
  • Neck Lift  
  • If you are pregnant or breastfeeding
  • If you have had Botox injections in the same areas within the past 3 months.
  • If you have any neuromuscular conditions like myasthenia gravis
  • If you are taking medications such as antibiotics that are aminoglycosides. The botulinum toxin can interfere with these drugs.
  • If you had previous injuries or surgeries to the injected areas
  • If you are allergic to botulinum toxin type A

A consultation is necessary for our practitioners to discuss your treatment goals, study your facial features and to tailor a personalised treatment plan. The procedure takes only a few minutes. The practitioner uses a small needle to inject Botox into targeted muscles. This discomfort is minor. There is minimal downtime or recovery. You will be able to return to your normal routine immediately after the injection.

Procedure is bearable even without numbing cream. Ice pack may be applied.

All Botox injections have minimal to no downtime. You are usually able to resume daily activities immediately after the treatment. There may be some redness and swelling immediately after the injection. You may also experience some mild soreness and muscle weakness in the injected part for a few days. However, this will usually subside within a short period of time. Other possible side effects of the Botox treatment include:

  • Allergic reactions
  • Eyebrows may droop temporarily
  • Slight inflammation or skin discolouration
  • Slight numbing or prickling sensation
  • Symptoms similar to flu
  • Temporary headache
  • Temporary nausea
  • Unsuccessful treatment