My painful dentist checkup

I woke up early in the morning to go to my nearby dentist clinic just a walk away from my home. Because lately one part of my teeth was sensitive to cold drinks so I was scared that I have cavities like what meiling said. When I went to the receptionist, she asked me what is my purpose of my visit. I said I wanted to check-up my teeth and she asked "only check-up? You want to wash your teeth or pluck your teeth or do filling?" When she asked me that question, I was a bit confused. Why am I here? I knew I wanted to do check-up on my teeth but I do not know what's my condition of my teeth? Ok that is not all. I went inside and the dentist ask me what is my problem, I didnt know? When he checked my teeth, he said that nothing is wrong with my teeth, just that my teeth is dirty so he did cleaning to my teeth. Definitely a painful process when he dig into my teeth to remove the dirt. The excruciating pain made me want to get out of here as soon as possible. Finally when this is over, I was still a bit confused why I went to the dentist because nothing is wrong with my teeth. The only problem is I didn't have dentist check-up for 3 years. (Normally you should check your teeth once a year). Anyway, the reason why I went to the dentist is because:
1.Meiling said that I have cavities. (Please don't scare me next time!)
2. I'm sensitive to cold drinks lately.
In the end, I spent 45 bucks just to clean my teeth. What an embarrasement at the dentist clinic! Another reminder to Meiling, please don't scare me again that I have cavities!