In case you are looking for a immediate solution then a dental scaling and polishing would help reduce the stains but there would be no change in the position of the teeth.
In case you are looking for a long term and permanent solution for the irregular placement of your teeth then orthodontic treatment would help.
Next Steps
Dental Scaling should be dine every 6 months so that oral hygiene is maintained
Health Tips
In case of teeth being crowded or not in proper order there is increased risk of tartar accumulation and staining as it is not easy for the patient to clean on his own.