No.
Mountain Dew cannot kill you but it's not healthy for you to drink a lot of Mountain Dew.
As long as you only drink the Mountain Dew in moderation it's okay to have Mountain Dew.
Just like any other sodas they can be bad for your health when consumed in excess and can lead to kidney failure and kidney disease.
Having a few sodas including Mountain Dew per day will not usually do you any harm as long as you're drinking water, tea, juice and other healthy drinks.
Soda can do harm when consumed in excess and you increase your chance for kidney failure and bladder cancer when you drink too much Mountain Dew.
I have a few Mountain Dew sodas everyday and I am still very healthy.