I worked in a nail bar for 5 years and doing beauty for 11 so I have seen all types of nails.
It all depends on how deep the ridges are on the nails to find out if there is any treatment. If the ridges are deep and start from the cuticle it could be damage which is then hard to treat, Some people have ridges on the nails if they suffer eczema you can tell this if the cuticles are really dry and sore, By taking your Omegas 3/6/9 will help grow your nails as well as skin and hair.
Also before treating the nail its important to find out what nail type you have as you could buy a treatment which can make them worse. If they are bendy they are soft if they are hard and break quite low they are brittle. Opi do great treatments also nailtiques but use if for 6 weeks and give them a rest you will see a big difference.
Cuticle oil is also great CND do solar oil its fantastic or you can use just almond oil,
I agree with one of the ladies about whitening the nails soak the nails in lemon juice but make sure you apply oil after as it can be quite drying
I hope this helps
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