Final answer:
Filing deep into nail corners can cause damage to the nail matrix, pain, and inflammation. It may also increase the risk of ingrown toenails.
Step-by-step explanation:
Filing deep into nail corners can cause several health problems. It can damage the nail matrix, which is the deep layer of epidermal tissue where nail growth occurs. This can lead to nail deformities and slow nail growth.
Filing too deeply can also expose the sensitive nail bed, causing pain, inflammation, and possible infection.
Furthermore, filing deep into nail corners increases the risk of ingrown toenails, which can be painful and require medical treatment.