Gaps in teeth can definitely be closed by means of aligners. But the tooth that is missing may have to be replaced after aligner treatment with an artificial prosthesis or implant depending on your bite keeping function in mind.
Next Steps
It is advisable to go for consultation with an orthodontist (braces specialist) to evaluate what options are open to you and whether aligners will help you in your treatment plan.
Health Tips
Clear aligners are removable appliances and depend on patient compliant, i.e. how many hours are you able to wear them on a continuous basis for them to work. Therefore, your commitment to treatment is of utmost importance for the treatment to get over in the expected timeframe.