Teeth may need to be removed for a number of reasons: orthodontic purposes, infections, tooth fractures, or large cavities.  Sometimes, if the tooth being extracted is going to be replaced by a dental implant or a bridge, a bone graft may be placed in order to preserve the contour and bulk of the jaw bone in that location, lending itself to a better functional or esthetic outcome, however this varies by individual.  Extractions are always done comfortably once completely numb, and laughing gas is available to adults as well, in order to help enhance the experience!