Curious after getting scaling treatment

I hear that getting a scaling every year is good, so I do it, but I'm not sure if it's right to do it annually. After receiving it, my mouth feels definitely clean, fresh, and refreshed, but strangely, I feel a sensation of tooth sensitivity afterward. I wonder if it's because my teeth feel like they are spreading apart or something. The cost isn't too expensive, so that's not a big issue, but after the procedure, I can't shake off this uneasy feeling.