The following precautions should be taken when using grinder

2-What makes a herb grinder wear out?

Long term grinding will make teeth no longer sharp

After multiple uses, threads will wear out (especially for grinding machines made of zinc alloy, thread wear is faster)
The holes will be blocked
The appearance will deteriorate

3-How to know when your grinder is worn out

3.When the finished product is no longer uniform and the rotation is no longer smooth when you grind,

 it means that your grinder has broken down

4-How To Prevent Your Grinder From Wearing Out Quickly

Do not put hard objects into the grinder

Align the threads before rotating during use
Clean after you use
Protect your grinder with a velvet bag
Purchase a high-quality grinder