I use to bite mine something awful ( teen age years) My friend told me to polish what I had left a bright color .. It took a few go arounds but I stopped biting because I didnt like chewing the polish and hated messing them up.
To help them grow out faster take a bit of olive oil and massage into the cuticle daily and all around the nail area until the whole area feels warm.. I always do this while watching Tv. Its also relaxing.
The only Bipolar retail therapy I have is nail polish .. I buy a few a month 1-3 bucks (Im cheap lol ).. I have over 200 bottles.

..Currently my toes are screaming blue and my fingers are black.
My T can usually tell how I am doing by the colors I am wearing