Orthodontics, veneers or full crowns can be considered for large gaps in 30 year old teeth, along with maintaining periodontal health. 1. Orthodontics: If the gap between your 30 year old teeth is caused by a malocclusion, depending on the teeth and periodontal conditions, orthodontics can be considered to align the teeth in the dental arch to reduce the gap. 2. Veneer or full crown restoration: large gaps between teeth can also be considered for veneer or full crown restoration to restore the excessive neighboring gaps, by preparing the teeth for the dentition, and doing porcelain inlays, resin veneers or porcelain veneers on the outside of the teeth to restore them. The gap between the teeth at the same time also need to pay attention to periodontal health, to avoid periodontitis caused by gingival papilla recession widening gap, orthodontic or dental restoration need to go to the regular dental hospital for operation.