@on_a_mission_ When I was little, apparently it was common to be seen at age 2, then not until age five. My teeth were fine at age 2, but I had a few cavities at age 5. The dentist filled them with silver-colored fillings (no crowns), but it was traumatic. I still can't eat banana-flavored foods (banana bread, banana pudding, etc) because some medication they used during the procedure was banana flavored (fresh bananas are fine, but no cooked banana foods for me).
Modern dentistry focuses much more on recalcification and uses higher-fluoride toothpaste if necessary. There is also a treatment to stop decay in its tracks for children called silver diamond fluoride.
See this article:
https://nyunews.com/news/2023/03/01/nyu-dentistry-cavity-study/
My dental hygienist said she is only aware of silver diamine fluoride being used to stop cavities and it makes a black mark where the cavity was (no coloration difference on healthy enamel), but for now, our dentist didn't want to use it for our kids, even with the prevention record described in this article.
I highly recommend finding another option other than crowns, but that is primarily coming from my childhood trauma.