Why Do Dental Hygienists Wear Scrubs Opinions Please...?

Opinions please...? - why do dental hygienists wear scrubs

I work as a dental hygienist - no dress code - all with just simple clothes, hair, etc.. cleaner future. Besides, I have not yet given, nor is there an employee handbook / rules, etc. to anyone else.

The first day I had a can of tuna, I opened and added lettuce - 2 minutes, the manager comes and says, essentially, "Who the hell is that smell, and do not know that the dentist sensitive nose. Blah, blah. And they went. No joke, was the next day to eat at the dentist? tuna salad! and lunch with the manager, I said nothing because I was new. Then more came, I had more lipstick, makeup a little more (do not forget not that we wear masks for 90% of the time) could not drink water until my break - but all ... .... hmmm, I askeded my hair cut - why? no idea, but not?
I consider myself as a hardworking and very well what I do and I think look good .. The Manager is offline, or simply do not like?