if you got your tooth pulled out, wouldn't that leave a pretty noticeable gap in you teeth?
do dentists do anything about that?
Suggestion:
Most extractions are due to irreparable damage and are prescribed by the dental surgeon, although there are people who mistakenly believe that removing teeth means they don't have to bother with oral hygiene and it's a lazy option. Little do they know they are making life difficult for themselves in the future, and most dentists with any conscience do strongly advise against it.
Root canal is actually an excellent compromise, as it just means extracting the "pulp" (the blood and nervous systems of the tooth), whilst retaining the tooth structure itself.
The answer to your gap question is: it all depends on which tooth is removed, where it is situated, and on the patients themselves. Many teeth can drift into spaces left by others, meaning the gaps aren't that noticeable or don't affect speech or eating that much. Other gaps can be filled by a variety of different appliances, including dentures, bridges (like crowns or caps that are attached to the teeth to one side or both sides of the gap), orthodontic applainces (braces) which push other teeth into better positions or implants, which are the "screw in" teeth mentioned in an earlier reply.
I hope that to helps answer your question 
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A root canal is more of a mandatory thing because the tooth is basically dying from the root up and it hurts, but nowadays caps and like 'screwed in' replacements (I don't know the phrase for it) are offered so that no gaps have to be left where teeth were removed.