Visible levator labii superioris muscles - can I inject Botox into these muscles without affecting my smile? (Photo)

I'm 38 with very pronounced levator labii superioris muscles in my upper lip area. They are not wrinkles (ie the grooves on my upper lip are very clearly the muscle underneath the skin rather than on my skin, these groves almost disappear unless I’m talking). I know these muscles are responsible for sneering and lifting the lip when smiling, so can I inject botox into these muscles without affecting how I smile?