"An appointment at dental service"

I went to the community dental service to have my teeth checked. During the appointment, the dental assistant had a glance at my teeth while holding the tubes for the dentist and told me that nothing was wrong with my teeth, some people's teeth are even worse. They might not have a bad intention, but I am not comfortable for someone to have a glance at my health then just tell me nothing is wrong. It made me feel that they didn't really care. This person was also just the assistant, not even the dentist. I felt very uncomfortable that the dental assistant crossed this boundary and told me nothing was wrong.  During this time, I was trying to talk to the dentist to ask for the sealant on my teeth and the assistant kept interrupting to give their opinion. I don't think this person is qualified to tell me their opinion and I didn't ask them either. 

I believe there was a careless check from the dentist, which i think might have been affected by the assistant, and then the dentist just told me nothing was wrong. This made me feel very bad and then let me worry about my health more.

I have fluorosis  on my teeth and the dentist keeps telling me to use the toothpaste with fluoride. But that'll just make the things worse right?  I'm really confused. In addition I want to help my gums to be clean as they are painful, but at the dentist they keep telling me just to use your brush and floss it harder, but the flossing  and brushing don't  reach the gum pocket. I just don't get it. I'm really confused and upset.