Which of the following is NOT correct about Raul and his work?

W: Today I have with me Raul Sanchez on our radio talk. He was a student at this college, er... how long ago?
M: I was here one and a half... no, two years ago now.
W: Raul was a student in English class when he was at this college, and he is here to tell us about the many problems facing a non-native speaker in a British tertiary institution. What have you been doing since you graduated, Raul?
M: I was quite lucky when I left the college, because I got a job pretty quickly with the London Dental Council. I’m still with them.
W: Could you tell us what course you took here at the college?
M: Yes, I originally wanted to work in advertising, but I found it was too hard because of my English. And so I changed my direction. I’m glad I did, because I’ve now got an Associate Diploma in Dental Hygiene, and that’s how I managed to get a job with the council.
W: What exactly do you do with the council?
M: I work with a dentist, making sure that the patients are taken care of and all the necessary tools have been cleaned and prepared for use. Sometimes I must assist the dentist in complicated procedures. It’s a demanding job, but I like it.
W: You perform dental surgery?
M: Not quite, but I do use tools to make the patients feel more comfortable during the operation. A lot of my time is spent in general checkups, cleaning teeth and demonstrating good dental practices. I also develop x-rays.
W: What exactly were the problems when you first arrived at the college?
M: I was very shy, you know. I couldn’t communicate with the students in my class because most of them were British, and my English was not very good. But I thought everything was OK, until I received the result of my first examination. The tutor was worried why I was so quiet in class. I told her it was because I was afraid to ask a question. So she suggested that I talk to the school counselor.
W: What advice did the counselor give?
M: Well, she was very kind and understanding, and I realized that I was doing the wrong course. You have to be an "extrovert"..., you know, outgoing. I think it’s a personal thing with me. You have to give a lot of opinions, and I am shy. So, she suggested I ask more questions in class, so I made it a rule to ask at least one or two questions every lesson.
W: So you swapped courses and began to talk more in class. Was there anything else that the counselor suggested?
M: Yes, she said I shouldn’t live with students from my own country. She suggested I should share a house with some British students. So I did, and my English improved much faster.
W: Are there any problems you currently have with English?
M: Of course, I used to have a lot of trouble with the technical vocabulary in my field, but I picked it up very quickly. Now, it’s mostly... I have difficulty trying to understand the colloquial language of Britain; the way people express themselves here is sometimes strange to me.
W: I see. How do you increase your vocabulary? Please give us some examples.
M: Well, I really like to watch movies. I recommend that you watch movies you have already seen subtitled in your native language, but this time only listen to the English, don’t read the subtitles! Also, it can be quite helpful to keep a journal of new expressions you hear so you can ask your English friends about them.
W: Let’s talk more about your course at the college. Do you remember any study projects you were involved in?
M: Well, once we did a survey on the effects of different breakfast cereal on children’s teeth. The ages ranged from 5-12 years old and we interviewed over 100 different kids from each age group, it was quite a big project! We discovered that many cereals that were advertised as being healthy were just as bad for teeth as the well known sugar-coated brands.
W: Really? I can’t believe that.
M: In fact, there are only few brands that contain many nutrients that help teeth grow and do not cause decay that leads to cavities and other bad dental hygiene. The problem is that many children become addicted to sweet, sugary cereal very young, and do not want to change.
W: Um, one last question. What about your future? Do you have any immediate plans?
M: Well, in the short-term I’ll continue to work as a dental assistant and gain more experience. After two years, I plan to attend dental school to become a dentist. My long-term goal is to open my own dental practice here in Britain, or maybe return to my own country and open a practice there.
W: I see. Thank you very much for sharing your experience.
M: My pleasure.