If it’s the standard hotend the tube touches the nozzle. It shouldn’t really be consumable but if you are printing at higher temps (i.e. over 220C or so) it can melt. If you are printing at those temps it’s worth swapping out for an all metal hotend.
It’s also really important to make sure the PTFE tube is cut really, really straight and even where it interfaces with the nozzle. I’m not sure if Enders come with a cutter but you can look up a Ptfe cutter online.
One more bit of advise is to use a high quality tubing like Capricorn PTFE since cheaper stuff can melt at lower temps.
[Ender 3 S1] Changing heatbreak PTFE
I’m changing the PTFE in my heatbreak, I didn’t realize these seem to be consumables. It started causing blockage....