Can I use lidocaine ointment 5% to numb my upper lip ,to tweeze hair without pain ?

If you have some noticeable hairs on your upper lip, waxing is probably going to be the most efficient solution for removing several hairs at once, but if you have sensitive skin, or you have just few to remove, tweezing is totally acceptable. Lidocaine is used for temporarily numbness. You can give a try but sometime it may cause allergic reactions or other problems.