A child will usually lose 20 teeth between the ages of 6 and 12. These 20 teeth are called deciduous teeth. Not only are these teeth here to help a child chew their food, they are also here to save room for the teeth that are to grow in when they are older. So even though you will eventually lose your deciduous teeth, they are important for the growth of teeth later on.
The teeth that replace the deciduous teeth are called permanent teeth. A person will have 32 permanent teeth by the time all their teeth have grown in.
Wiggling the tooth is fine and can help the process along, but forcing the tooth out can cause infection. Losing teeth is an exciting time so enjoy it and have fun with it.