If the teeth and molars do not fit together well, do not line up nicely or the molars do not fit together well, the dentist can refer you to an orthodontist. Depending on the type of abnormality, the orthodontist will recommend a fixed brace (locks) or a removable brace.
With removable braces, performing good oral hygiene is no different than if you were not wearing braces. See tips and advice "How do you brush your teeth?"
With fixed braces (locks) removing plaque is more difficult. It is important that you make sure that the plaque along the gum line and along the edges of the locks is properly removed. This prevents cavities and inflammation of the gums. Optionally, you can use interdental brushes to remove the plaque between the teeth or under the wire. Ask your dentist for advice on what may apply to you.