After your tongue piercing, you will ultimately learn to talk clearly. You just need to get used to the sensation of the piercing. If your profession needs a lot of talking, you should inform your boss about your intention to have a tongue piercing. Otherwise, take a few days off till your speech improves. Then go back to work. The reason why it is difficult to talk right after getting a tongue piercing is because there are no muscles to guide your voice. So you must exercise your tongue to be able to use it properly. Start by making sure that you drink enough water to keep your mouth moist and avoid drying out which can lead to pain when eating foods that require saliva for digestion such as meat or cheese. Also, make sure to speak slowly and clearly so you can improve your speech clarity. If you are not used to speaking after a tongue piercing, then you might want to wait before going back to work or interacting with other people. It is normal to feel nervous at first but once you get used to it, you will see that it is easier than you thought to talk clearly.