Strong teeth, nails and hair come from within. A healthy diet rich in minerals and proteins and all the vitamins needed to maintain health is of vital importance.
Illness, medicines, genetic make-up and other things can contribute to thin hair or unhealthy hair.
Google healthy hair on the net and read what comes up. Learn what the components are that make all the above grow and florish.
Once you correct the inside you can certainly find tons of products on the market that will keep it shiney and stop breakage.