Hello,
As you are 25 years old, I would suggest you to go for fixed orthodontic treatment ( metal braces or other braces of your choice) as it is the only permanent cure for spaces. If the spaces are less, gaps will be filled within 6 months with proper alignment of teeth. Price & payment mode varies from clinic to clinic, so you need to ask the orthodontist near you about the same.
Next Steps
Visit an orthodontist
Health Tips
Braces have no side effects as adult orthodontics is available now a days.