Iโve heard the chewable vitamins can be rough of the teeth, because particles of the vitamin will get stuck in the teeth/gum for awhile. On the flip side, vitamin deficiencies can also cause dental problems... https://www.barilife.com/blog/secret-complication-after-bariatric-surgery-2/
Also- keep in mind that increases nausea is a bit of a problem that many of us face. Stomach acids are awful on tooth enamel. You can read up best practices for cleaning up post-vomit here: https://www.rdhmag.com/articles/print/volume-32/issue-1/columns/preventing-dental-erosion-in-the-pregnant-patient.html.
The article references pregnant patients, but the basic point is that stomach acid is, well, acid and you should try to neutralize the acid in your mouth, as opposed to brushing the acid all over and into the teeth.