Orthodontics
Having crooked teeth or large gaps between your teeth can cause problems. Food and bacteria could get stuck between the teeth which could cause decay. Similarly, if your teeth stick out, this could cause problems, either with mouth ulcers and decay, or with speech problems. Your dentist might suggest that you have your teeth straightened through orthodontics - by wearing a brace.
The majority of orthodontics are carried out on teenagers, but increasing numbers of adults are opting for orthodontics too. Your dentist will probably refer you to a specialist - an orthodontist - who will take examine and probably x-ray your teeth to see how best to straighten them.