Is there any side effects in using hair-colours or hair dyes

I think there are some side effects on me. First of all, after the color faded, it makes my hair easily got gray. Maybe because I have a very sensitive skin (also in my scalp) and thus the chemical substances makes my hair gray. Secondly, my hair feels so dry. Hence I should apply some conditioner on it to reduce being dry all the time. I have sensitive reaction to some coloring products, especially those with high chemical substances. So now I try NOT to color my hair again...

Yes. There are a lot of side effects. You need to dye your hair every time the colour comes off....sometimes the colours don't look natural.There are a lot of chemicals in the dyes which make the hair loose its natural shine and moisture and makes the skin dry and the hair rough, it also damages the hair follicles. Sometimes there's hair loss too when you use the dye regularly. It better to use Heena...Mehendhi on the hairs as its a natural dye and doesn't damage the hair.

to the extent of my knowledge i have never heard of any side effects other then you hair turning a different color then what you wanted but i really never researched this so i hope a person smarter in this topic will answer your question good luck