Hi Michelle!
The massetor acts on ur jawbone and helps chewing. Like all the bones in your body, a lack of muscular action on them would cause a decrease in bone density, that’s why exercise is recommended to increase bone density and prevent osteoporosis in the elderly.
Botox of the massetor reduces the action of chewing, and thus may cause some bone resorption. However the effect is minimal and has not caused any complications to patients in my practice or in the literature.
Hope that helps!
Regards,
Dr Harvey Ho
