I neither suspect nor worry, myself. I just used to make sure she was well aware of my washing and oral hygiene standards and if she was still enamoured she was probably smart enough to take care of everything. That is, I did stop washing EVERY woman I dated a few years back after progressing to just telling them I used to do that and making sure they know hygiene is top of list for me. If someone didn't take the hint well, I'd go back to old habits of washing them.
Which was kind of hot, tbh. A woman making all her parts available for washing until my satisfaction was always something I enjoyed, and something that turned them on as well.
Anyway, I told my gf about this thread (I'm retired from dating, apparently permanently) and, after a brief discussion on "how do you get into this subject on an MMA forum?" she told me to correct anyone who said that washing women and improving their oral hygiene was a bad thing. She always washed well, and even used a wash cloth, and she brushed well but didn't brush her tongue and I could tell on the first kiss.
I believe, after a brief kiss, I asked her if she brushed her tongue, lol. Ah, life..... anyway I introduced her to tongue brushing and tongue scraping and she was infinitely grateful and has gotten tongue scrapers for her two girls as well. She wanted me to report back that whenever I washed her it was romantic and sensual and that she is super thankful I taught her that the tongue is not "self cleaning" in everyone's eyes (including hers now).
To each their own. We all have to find our comfort levels.