It’s been a long time since I read Dracula but I remember really struggling with the start. Nearly quit a few times and it was slow going. At some point it flipped and I think I pretty much finished the book in one sitting. Anyway, it is great and was worth the rough start I had with it.
This is how it should be!!!
If you can feel more than nothing during the root canal (or any dental work) then you need more anesthetic. Dentists aim to give you as little as possible so it is up to you to let them know if you have any feeling. It can start to wear off too, you’ll know and should tell them so they can give you more.
Take earbuds and listen to some music during it. Let the dentist know and they will probably be fine with that.
Edit: Read more of the thread. Don’t get high, it can interfere with the anesthetics. Your tolerance to them can be higher as well. If you feel comfortable with it you can talk to your dentist about it.