How do nails attach to the nail bed?

So my toenail got bruised, drained fluid out, now like two-thirds of the upper right of nail isn't attach to nail bed (but left side is).





I read that the new nail growing will attach itself to the nail bed while the part unattached at the moment is useless.





So what makes the new nail growing attach itself to the nail bed? I'm worried it won't.How do nails attach to the nail bed?
FINGERNAILS


Anatomically fingernails and toenails, which are made of a tough protein called keratin and are produced from living skin cells in the fingers and toes, are made up of many different parts:





The free edge is the part of the nail that extends past the finger, beyond the nail plate. There are no nerve endings in the nail - this is the growing part of the nail still under the skin at the nail's proximal end.


eponychium or cuticle, is the fold of skin at the proximal end of the nail.


paronychium is the fold of skin on the sides of the nail.


hyponychium is the attachment between the skin of the finger or toe and the distal end of the nail.


nail plate is the hard and translucent portion, composed of keratin.


nail bed is the adherent connective tissue that underlies the nail.


lunula is the crescent shaped whitish area of the nail bed (when visible)


nail fold a fold of hard skin overlapping the base and sides of a fingernail or toenail.


In common usage the word nail usually refers to the nail plate only.








GROWTH


Nails grow at an average rate of 0.03 centimeters a day (3 cm every 100 days).[1] Fingernails require 3 to 6 months to regrow completely. Toenails require 12 to 18 months. Actual growth rate is dependent upon age, season, exercise level, and hereditary factors.


This growth record can show the history of recent health and physiological imbalances, and has been used as a diagnostic tool since ancient times.[2] Major illness will cause a deep groove to form across the nails. Miscoloration, thinning, thickening, brittleness, splitting, grooves, Mees' lines, small white spots, receded lunula, clubbing (convex), flatness, spooning (concave) can indicate illness in other areas of the body, nutrient deficiencies, drug reaction or poisoning, or merely local injury. Nails can also become thickened (onychogryphosis), loosened (onycholysis), infected with fungus (onychomycosis) or degenerative (onychodystrophy); for further information see nail diseases.





Fingernail INJURIES


The fingernail and the underlying nail bed are the most commonly injured part of the hand.





Nail that has torn or separated from nail bed


It can be very painful to tear or rip your nail. A nail may separate from the nail bed for many reasons, including injuries- which is your case:





INJURIES.


Separation caused by injury is common in people who have long fingernails. The nail may pry away from the nail bed when it is accidentally hit or jammed.


Severe or repetitive toe stubbing may cause a toenail to separate from the nail bed. This is also common in athletes who wear shoes that are not roomy enough.


The usual treatment for a separated nail involves removing the nail, keeping the area dry to prevent infection, and waiting for a new nail to grow. The infection or skin condition that caused the separated nail will also need to be treated. Home treatment often helps relieve pain, promote healing, and prevent infection.





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Once a nail separates from the nail bed for whatever reason, it will not reattach. A new nail will have to grow back in its place. Nails grow back slowly. It takes about 6 months for a fingernail and up to 18 months for a toenail to grow back.How do nails attach to the nail bed?
When you get an injury on any finger or toe and it has that big red spot where the blood has collected it is necessary to relieve the pressure and put a small hole into the nail as the nail grows most of the time it will become detached from the nail bed you need to trim the detached part away and maybe cover with a band aid until it can grow out completely so it won't get caught on anything and tear into the corner that is attached and eventually it will all be attached.