Smile lines after masseter Botox (Photo)

I’m 18 years old and got 50 units of botox in my jaw for clenching and grinding at night. A couple months in I started noticing smile lines developing and getting deeper. Is this because of the amount of volume I lost in my face? Because I’m still so young will collagen in my body be able to deal with them? And also will they go away once the botox wears off?