Filling fell out no pain, yet full drilling

[Lala]

Hello

A filling fell out and I had no pain

My dentist said to me : “You don’t have pain do you?” ( I don’t know how he knew as I didn’t tell him)

He took X ray, he gave me a local anasthetic and started to drill quite a lot)

He said “even though you had no pain sometimes it develops after procedure. The hole is quite deep and if pain - you would need a root canal or implant”

Sure enough I started having pain and 2 weeks passed in pain( not strong though)

My question is:
1.how did he know I had no pain
( did I have root canal there I forgot about?)
2. why drill if I had no pain?
3. Why not just do a new filling

I’m so worried as I already have implants ( so lost my natural teeth)

I would be grateful for advice

 

[Lala]

I just want to add - this dentist wouldn’t know my past history and this was my first visit with him

 

[honestdoc]

1. My interpretation since this dentist never saw you before is that the wording came out the way you heard it not fully knowing.
2. It is impossible to diagnose in this platform so my guess is to prep the tooth for solid filling retention, strength and to remove any cavities or contamination
3. If I had x-rays and did a clinical exam, I could better answer that question. There are too many variables.