Dental Query. I take after scaling?

Hello Doctor, I am a student, and my teeth have developed yellowish, milky-white, and watery-white spots. They don't look good, and I am concerned about their appearance. When I ask my father to take me for dental scaling, he refuses. He says that scaling makes teeth weak. He also shares his experience, saying that he and my mother had scaling done, and after that, they started experiencing tooth pain and sensitivity. He believes that scaling makes teeth more delicate. Because of this, he does not take me to a dentist. I would like to know: 1. Does dental scaling really make teeth weak or damage them? 2. What is the approximate cost of scaling? 3. Can I visit a dentist and get it done on my own? 4. What precautions should I take after scaling? I would be very grateful if you could give me genuine, honest, and practical advice. Thank you❤️ for your time and guidance.