A nail correcting apparatus which is used for treating ingrown nails seen in human feet or hands and which can be adjusted according to different nail widths and changes that can occur in time on the same nail, characterized by comprising: pins enabling connection of adjustment billets; the adjustment billets with pinholes (1.1) and screw sockets (1.2) in them, wherein the adjustment billets can move forward and backward on the pins, so as to move towards or away from each other; a screw threaded through the screw sockets (1.2), which can be twisted in its axis, enabling the adjustment billets to move towards or away from each other; an adjustment nut with key holes (4.1) mounted on the screw, enabling the screw to be twisted around its own axis; a key positionable within the key holes (4.1) on the adjustment nut, enabling the adjustment nut to be twisted leading to the screw's movements; ratchet clasps, connected to the screw on both sides, which enable bands to be tightened and not easily detached; the bands are elastic or semi-elastic and have ratchet holes (6.1) on them that can be applied in an adjustable fashion, through ratchet parts to the ratchet clasps from both sides; rings that can be applied directly on the screw or to the adjustment billets, connecting the ratchet clasps to the screw in a tight manner; additional clasps which further connect the ratchet clasps with the screw so that the screw does not slip or move; nuts which may enable the bands to be connected to the screw by means of contralateral ratchet holes (6.1), when required; a supporting apparatus placed under the nail to loosen inward nail curves by tightening and expanding as required; and a bolster placed between the nail and the adjustment billets helping the apparatus to be kept in place without slipping. pins enabling connection of adjustment billets; the adjustment billets with pinholes (1.1) and screw sockets (1.2) in them, wherein the adjustment billets can move forward and backward on the pins, so as to move towards or away from each other; a screw threaded through the screw sockets (1.2), which can be twisted in its axis, enabling the adjustment billets to move towards or away from each other; an adjustment nut with key holes (4.1) mounted on the screw, enabling the screw to be twisted around its own axis; a key positionable within the key holes (4.1) on the adjustment nut, enabling the adjustment nut to be twisted leading to the screw's movements; ratchet clasps, connected to the screw on both sides, which enable bands to be tightened and not easily detached; the bands are elastic or semi-elastic and have ratchet holes (6.1) on them that can be applied in an adjustable fashion, through ratchet parts to the ratchet clasps from both sides; rings that can be applied directly on the screw or to the adjustment billets, connecting the ratchet clasps to the screw in a tight manner; additional clasps which further connect the ratchet clasps with the screw so that the screw does not slip or move; nuts which may enable the bands to be connected to the screw by means of contralateral ratchet holes (6.1), when required; a supporting apparatus placed under the nail to loosen inward nail curves by tightening and expanding as required; and a bolster placed between the nail and the adjustment billets helping the apparatus to be kept in place without slipping.