I advise persons with sensitive teeth to avoid citric acid, and toothpastes containing sodium fluoride.

Both of these things strip away all natural protection, including reducing the protection of potassium nitrate. Whichever numbskull that thought of using NaF with KNO3 needs to be publicly tormented until they die of starvation. Preferably including lots of needless drilling into their teeth root nerves.

Also, whichever numbskull who thinks it's a good idea to make everything pH 3 using citric acid made using e. coli, please, just stop it.

I'm dying here, can't think about anything with my whole jaw zinging.