If it's got sodium monofluorophosphate, it's not so bad. Fluoride doesn't get bumped off by many things, iodine, chlorine, bromine, (elemental). But just check the ingredients list on a lot of toothpastes sold as "enamel" boosting. Sodium Fluoride. As I said, Fluorine is very strong at bumping other things off (oxidation). The use of a NaF toothpaste, combined with excessive amounts of dietary citric acid, ie common energy drinks and snacks with the "peri peri" or whatever similar name flavor... This resulted in a full week of toothache for me. The toothpaste in question was Sensodyne, which is seemingly the only one that has Potassium Nitrate (saltpeter) in it, which deadens the exposed nerves underneath chipped and damaged teeth. I immediately threw this garbage out and switched back to the plain Sensodyne, which has Sodium Monofluorophosphate. Sodium Fluoride is almost as acidic as hydrochloric acid, all by itself, even with the sodium attached. If you want to prove it for yourself, if you can get your hands on a little sodium fluoride, put some in water and then drop a piece of chalk (calcium carbonate) in it, and let it sit for a few days (sealed up) and come back to me about fluoride. See, I never hardly read anything about this except for some text years ago that described how in a city where fluorapatite was processed (one of the minerals used in producing gypsum and superphosphate, via the use of sulphuric acid), and lo and behold, look what the second chemical named for use in chemical etching of glass is:

Glass etching - Wikipedia

Should sodium fluoride be in toothpaste? Definitely not, if you have chips like me, unless you like toothaches. The absurdity of putting this crap in toothpaste at the same time as potassium nitrate is outstanding. Fluoride can create a quite hard, and brittle surface on teeth, that is indeed a little harder and more chemical resistant than normal tooth enamel, which is made of sodium triphosphate, which is also quite resistant to chemical attack. But sulphuric acid and sodium fluoride both attack this substance and plant fluoride atoms on it. The bogus science around fluoride hinges up on some studies that found that around age 7-8, fluoride in water reduces the occurrence of cavities in the few years later. Guess what? That's when you start to have your last molars erupt, the teeth that are the most liable to cavities in combination with a diet high in sugar. Straight up collusion between chemical industry and sugar industry. It's poison. A neurotoxin. It substitutes for chloride in the ubiquitous chloride channels that are everywhere in the nervous system. Sufficient fluoride contaminating these channels causes death. It's a neurotoxin in amounts not far above what people are absorbing from food and indirectly via fluoridated water in food processing and production.