True, but the diet versions are generally worse, believe it or not. About the only other difference between diet and not is presence of "real" natural sugar or some artificial substitute.
And sugar/acid rots your teeth, don't you know? But simple physics tells you that drinking it down (and even through a straw) instead of sipping it / swilling it around your mouth (like kids do) is actually better because the exposure time on the enamel is lengthened significantly if you swill it and that's the biggest danger. You can watch a tooth dissolve overnight if you leave it in coke, but that's not what happens in your mouth if you just drink it normally.
Hence, we should make straws compulsory, and drinking the drink in one go, in preference to any kind of ban whatsoever because that has a quicker, more obvious, harder to tackle, and easier to manage effect on teeth than anything to do with calcium-leeching. Which kinda makes it obvious just how relevant the damage to your calcium is compared to anything else you eat/drink damaging you (i.e. not).
Personally, I drink SO MUCH coke that you'd probably recoil in horror. Seriously. I do not drink tea, coffee, alcohol of any kind (not religious, just can't stand the taste and don't see the point, and have a father who worked for breweries all his life which has meant "free beer" since I was old enough to try it) or water (except at work where I'm not allowed to bring in fizzy drinks - I work in a school) and my main beverage is actually coke. I buy it en-masse from the local Costco, because I get through that much of it. When they don't have it, I use Pepsi or some equivalent. When I go shopping, I do not buy any other beverage unless it's for guests.
My ex-wife was the same, and independently of myself before I met her, her father has also been the same for years and researched the effects as a "proper" scientist too and made her stop holding the drink in her mouth when she was little - same for sweets, a boiled sweet or chewing gum running around your mouth for ten minutes does more damage than 2 litres of coke passing over only your tongue. He's also a professional fitness instructor, qualified science teacher with several PhD's, and they both ran karate clubs for decades which killed almost all visiting black-belts through sheer stamina and fitness levels that were unrivalled outside of professional sports. With my ex, it was caffeine-free diet coke though (even though that has more of a calcium-leeching effect).
I've done this for literally years - since I was a teenager living at home. My parents have Coke on standby for when I visit because they are so used to it, my girlfriend's parents in Italy stock Coke especially for me, and when I meet up with my ex- or her father still we invariably have two cokes. When I go to a pub or restaurant, no matter the country, or how posh, I drink Coke. When I go to a friend's house, they know it's Coke or nothing. I have a sip of wine at Christmas to be social and toast with others, but otherwise it's Coke. It doesn't even need to be "proper" Coke, or Pepsi, or a named brand.
My teeth? I haven't been to a dentist in about 15 years and have no problems with them (in fact, when I was starting university I had to have many milk and wisdom teeth forcibly removed to make way for adult teeth - they were all in pristine condition and refused to budge without an operation).
My bones? I've never even broke, fractured, or damaged a bone in my entire body in my entire life (but that's purely anecdotal and doesn't indicate they won't be weaker in years to come).
My sleep? I drink caffeine all day long, every day, and never have trouble sleeping (this is because caffeine has a tolerance effect that builds up, of course, but I still love it when people drink coffee all day long and then refuse a coke unless it's caffeine-free because "they won't sleep tonight". When I don't have coke for a day, I get a slight headache the next day and then it passes - tested on periods up to two weeks long).
My weight? I'm actually bordering on underweight, have no diet (or toilet) problems, and eat like a pig all day long.
My doctor? In the last 15 years, I've seen three doctors, and only to register with them and to have interventions not related to diet or lifestyle (e.g. wisdom teeth pulling, swine flu etc.). I can count on one hand the total visits to doctors over that time. Whenever I register with them, the blood tests and fitness tests pass straight through without comment. My blood pressure, weight, BMI, etc. are normal, always are every time I have them measured.
About the only downside to my beverage of choice? When I had norovirus a few years ago in Italy (the last illness of any kind I had, and not surprising when you change country and meet 50+ people for the firs time), I'd just drank Coke and the resulting explusion was black. It merely made people think they needed to phone for an ambulance until it was explained.
If you want to enforce bans, then you need to ban the right thing. A fizzy drink isn't dangerous, even if you're drinking literally hundreds of litres a year and nothing else for decades. What's MORE dangerous is washing it over your teeth for an unnecessary length of time (your teeth have no taste sensors, so why do it?). Thus the "ban" should be on boiled sweets, chewing gum (even "sugar free" which has the exact same sweeteners in it as diet drinks), anything that "fractures" in your mouth or sticks to your teeth like popping candy or chewy bars or even cereal bars.
Similarly "banning" fatty foods should start with muesli. It's fried. Don't believe me? Go compare the nutritional information of muesli with ANY OTHER CEREAL (last time I did so with sugar-covered honey-nut corn flakes, the corn-flakes won hands down no matter what the brand, sometimes by as much as half the fat/carbs/sugar as the muesli).
Also, a school banning those things (like mine, and most others, already do) does nothing - the parents will still pack it in lunchboxes (and be told off by the school, so they'll put it in their kids bags and tell them not to tell the teachers), the older children will pop to the tuck shop down the road, and the others will go home where it will be freely supplied. All you would do is increase the chances of kids desiring it because it's "illicit" in schools. It would have to be a BAN, outright, and that seriously infringes on my lifestyle choice that is literally hurting nobody and not added ANYTHING to a health service burden.
Ideally, though, what we need to ban is stupidity and people drawing single-line conclusions from newspaper reports instead of finding out THE TRUTH about what they are eating.
Ban tomato sauce (serious health risk as it's almost impossible to tell when it's gone off and is often consumed outside of the best before dates, that's before you even consider the sugar in it).
Ban boiled sweets, toffees and most sweets in general.
Ban cereal bars.
THEN you can ban a fizzy drink for leeching your calcium.