As the nails grows outward it should be filed in order to keep its length such that it does not interfere with usefulness of the fingers or harbour bacteria, protozoal cysts or parasitic ova.
the cuticle that is not cared for attaches itself to the nails and tears as the nail grow out forming hangnails , if these develop they should be carefully cut rather than pulled, since infection can occur if delicate tissues are injured.
Nailbiting is unhealthly . the pactrice of grooming long nails and painting them is also unhealthy.
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