Large hole in the front tooth – what the dentist does?

Hey, I have a problem. Have had a hole in one of the two front teeth in the upper jaw for a long time. The hole is pretty big, maybe 1 centimeter in diameter. I don’t know if you can call it a ‘hole’ but in any case the tooth in front is damaged, with a deeper level inside. I finally took my courage together and got an appointment with the dentist before it got worse. Still have animal fear and would like to know if you have any experience with this. What does the dentist do in such a situation? Is that still possible with a filling? If so, does it hurt? I also read that the tooth may have to be extracted, that would be my biggest nightmare. Thanks in advance for the answers.