Is it obligatory to trim the nails completely, or is it sufficient to shorten them while leaving a part of them, and what is the amount that conforms to the fitra?

Trimming the nails is among the practices of the fitra (primordial nature). It is not required to completely remove them, but rather to remove whatever extends beyond the fingertips, to prevent the accumulation of dirt. One should regularly trim them whenever they grow long. It is recommended to check them from one Friday to the next, and it is disliked to leave them for more than forty days.