Had a cracked tooth age 40, dentist said leave it alone until it hurts.
Age 52 it became infected, root canal 5,000bht. Didnt bother with a crown.
Age 66 a few chunks have broken off the sides, still good enough.
I've always found UK dentists unscrupulous and quick to make money from unnessicary work.
Back to op, root canal in Thailand was 4 visits over 3 months.