When removing a tooth it is important to consider what will be done with the empty space after that tooth is removed. If a tooth is removed and nothing is done with the extraction site, the jaw bone will degenerate and change shape during healing and can cause your teeth to shift. This can create problems in your bite and affect your ability to speak and chew.
Healthy bone levels are required to replace missing teeth. If you want to fill the space with a dental implant, a sturdy jaw bone is necessary to place the implant. If you opt for a dental bridge, the bridge must be molded and placed before the teeth shift. A bridge without much bone underneath it will often be easily noticed because the false tooth will appear unnaturally large or long.
Preserving the extraction site avoids the problems discussed above. Your dentist is always open to a conversation on what you would like to do with your extraction site before removing a tooth. They will be able to make a recommendation and layout a treatment plan.