Been using the same antiperspirant for 7 years. I have bad allergies and sensitive skin so once I find one that works for me I stick with it. My stockpile I bought last year was finally running out so I bought a new can. Identical packaging, absolutely no difference on the outside. I used it for the first time today and discovered that they added some kind of powerful, harsh fragrance to it which immediately irritated my eyes and nose. Then after a few minutes my armpits broke out in a rash. I’m fucking livid.
If there was a long time between purchases I would absolutely do that. I’ve got people I care about with food allergies so that’s been a prudent strategy for me. Brands change shit all the time. Most people with allergies do that too