Totems arent used when you die if they are in the head slot, this dosent affect almost anyone in the minecraft community, mostly just personally bothers me.

Steps to reproduce:

1.17 and up:

Run the command "/item replace entity @s armor.head with minecraft:totem_of_undying"

without quotes

1.16.5 and below

Run the command "/replaceitem entity @s slot.armor.head minecraft:totem_of_undying"

without quotes

Edit: I am aware that after snapshot 24w37a it states that you have to hold it for it to activate, this website dosen't let me select versions older than 1.21.3