Does going to get your hair dyed in a salon keep the grey's out longer then using a at home kit?

grey hairDoes going to get your hair dyed in a salon keep the grey's out longer then using a at home kit?
Not real sure.. I always do the home kits and if you do the permanent dye mine last about 4-6 monthsDoes going to get your hair dyed in a salon keep the grey's out longer then using a at home kit?
it will really help if a Professional does it
Going to a salon,only means, you will be paying a lot more money,than doing it for yourself.Try Loreal,or ultress,it really helps cover grey longer,it's worked for me.Good Luck!