You should know that many times the reason that teeth are not straight is because they are a little too big to fit in the space provided by your jaw. The alignment process may involve slightly modifying the width of one or more teeth. This will allow the teeth to align neatly in the allotted space. The dentist may also have to attach small knobs onto your teeth so the plastic aligners can grab the tooth and pull it correctly. These small attachment points are clear invisible plastic and will be removed later.