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In a few people, diastema is caused partly by an undersized lateral incisors (the teeth right next to the two front center teeth) – in which case, your orthodontist will decide if these teeth should be made wider by using crowns, veneers or bonding. In other cases, diastema can be due to a very large frenum (that piece of gum tissue above and between your two front teeth). If your frenum is very thick, it can inhibit the regular growth of the teeth and the natural closing of the gap between the two front teeth. The orthodontic treatment that will be given in this case could be ineffective except if the tissues will be taken off in a process called frenectomy.