Hi Ayushi There are so many ways that you can improve the health of your hair and a combination of all would be my advice.
Include hair super-foods in your diet : I would recommend that you should include salmon, eggs, avocado, walnuts and blueberries in your shopping trolley to begin with. ...More >
You should also regularly visit a stylist who can trim your hair which will banish split ends and the ongoing damage that they cause.
As far as products go, in the first instance look for a very good professional product something like Nioxin would be ideal. Their intensive moisturising treatment is amazing at smoothing the hair and their whole range is about respecting and treating the hair and scalp.
I would also recommend that if you colour your hair, you seek professional advice to limit the damaging effects that a lightening process could have on your hair!
I hope this helps!
Best wishes, Eva