I am addicted to coke zero, and am concerned about the effects it has on my teeth, what should i drink instead?

Avoid if possible: Diet sodas are not overly harmful to teeth if used in moderation and hygiene is good. They probably should be avoided for many other medical reasons as should most sodas.

WATER: Drink water! all sugary drinks are really bad for your teeth. Try adding lemon and other fruits to your water if you really want flavor.

Agua. Water. : Do what i say, not what i do. Sadly, i'm hooked to that stuff as well so i won't pontificate on what you should do. Instead, as a fellow "diet soda anonymous" member, i'll wish you strength, consistence, and best of luck. Happy holidays.