I guess you got your tooth extracted and you are having lot of pain after that . Sometimes there is no remaining tooth piece it's a sharp edge of the bone socket in which your tooth was. And at that particular area there is lot of pain due to the exposed bone. The tablets will help you symptomatically in relieving the pain and to reduce infection and inflammation.

You should get xray done if you feel broken piece left. Also if tooth piece is left inside, tablets will only give you symptomatic relief. You need to get it removed by visiting dentist.