Large gaps between thinning teeth can be closed by orthodontic treatment or dental restoration. 1. Orthodontic treatment is the first choice for sparse teeth, by taking a full mouth radiograph of the teeth to rule out supernumerary teeth, if supernumerary teeth are present they need to be extracted or the gap will be difficult to close. The best time for orthodontic treatment is during childhood when tooth replacement is complete, around the age of 12. 2. If adult teeth are sparse, the gap can be closed through dental restoration. If the gap is large and accompanied by missing teeth, orthodontic methods can be used to centralize the gap for dental implant restoration or porcelain crown restoration. Therefore, the gap between the teeth can be closed by orthodontic treatment, or resin restoration or dental implant restoration. The specific situation can be examined in the dentist to formulate the next plan, and follow the doctor’s instructions to deal with.