I recommend Nere wax strips.

It is designed to be easy for even beginners to use; you can cut it with scissors and use it for various purposes. It can be used on the philtrum, eyebrows, legs, or underarms. Since it pulls out hair from the root, I think I didn't see any hair for about four weeks. Of course, it might vary from person to person. There is a slight redness, but it subsides quickly. It is even better if you apply an aloe moisturizing cream after using it. It pulls out hair very effectively, and I liked it.