A seamstress with 60 years of experience told me this secret!

With the toothbrush, simply cross the thread from one side of the brush to the other and take the needle from the side of the eye where it is threaded, press a little and the thread is inserted into this channel.
With an empty tablet or a blister pack of tablets, simply cut a thin strip, make a small cut on one of its sides and leave a tip. Then the test is done by simply placing the thread in this cut and passing the needle from the same hole or eye, passing the thread in this way safely.
With a cotton swab, proceed by cutting the sides with the cotton of the cotton swab and thus we will have a kind of plastic tube. A thin thread or a bristle of a broom is threaded through it, creating a small hook. This type of hook is used to easily pass through the eye of the needle and insert the thread to be threaded.
This is probably the most common and best known method. It consists of slightly moistening the end of the thread with saliva or water. This helps the fibers of the thread to stick together, making it easier to thread. Although simple, this trick is very effective, especially when the thread frays easily.