Could The Damage To Masseters Be Reversible?

I have been having botox to masseters originally for grinding, hypertrophy of masseters and headaches. I have been having treatment twice a year for about three years. 2 months ago I had another treatment, with my previous treatment 8 months prior to that. I was just doing what the doctor told me and didn t really assess my face/jaw to see if the botox was needed. My masseters were no longer large as I now realise it was not needed. My masseters have completely disappeared and my jawline doesn t look natural. Will this be permanent or will my masseters regain size? Very depressed!