How long will a 3mm gap in teeth take to close?

It is difficult to provide an accurate timeline for how long it will take to close a 3mm gap in teeth without knowing more information about the individual case and the specific treatment being used. Factors that can influence the duration of treatment include the severity of the gap, the type of treatment being used (e.g. braces or aligners), the patient's age, and their oral hygiene routine. In general, it can take several months to years to close a gap of this size, with the average treatment time being around 18 months. However, it is important to consult with an orthodontist or dentist to get a personalized treatment plan and timeline based on your individual needs.