Botox can be injected into bulky Masseter muscles on both sides of your face. This relaxes the muscles, giving an overall appearance of a slimmer jawline, and possibly more pronounced cheekbones. Botulinum toxin stomach injection is a minimally invasive outpatient weight loss procedure. It may be appropriate for people with moderate weight loss goals, and it typically leads to a loss of 5% to 10% of body weight.