“A stitch in time saves the nine” I say “A dab in time save a stitch”. How to keep buttons from falling off?

From time to time the buttons on a shirt keep falling off. Finding the matching thread and securing it is a hassle. Sometimes we don’t find the button itself. Like they say “A stitch in time saves the nine” I say “A dab in time save a stitch”. 

Just cut any lose threads and dab with two coats of clear nail polish on both the sides of the button (as shown in the image).

You can also use the Fabric glue to do the same. At first when you apply the glue it looks shabby but it will be clear when it dries. Make sure to apply a very thin coat of glue.