Most people think that its no big deal to get a tooth taken out. they will say things like "its just one tooth" and "I've got a ton more". Well, you do have a lot more teeth then just that one but this does NOT mean that getting a tooth out will not create many other problems in the mouth.
Some of the problems that can occur are as follows.
#1 The tooth that chews against the tooth you just took out will move up, or down, into the spot just vacated by the extracted tooth. This top tooth is moving down into the mouth.
#2 The teeth right next to the extracted one will begin to tip into the spot just vacated by the extracted tooth. These next two pictures were taken 5 years apart. The patients tooth tipped completely over and needed to be extracted.
Both of these can cause your bite to be thrown completely off and make chewing uncomfortable.
#3 As you chew hard and crunchy foods, they will pinch up against the gums where the tooth used to be.
Moral to the story is
if you can fix your teeth, then do it.
If you can't, then get the hole filled where the tooth used to be ASAP.