Hi,
Mal-aligned teeth causes many problems, cavities are one of them. Because of the mal-alignment of your teeth, food gets stuck there which causes decay in your teeth over a period of time,as well as tartar and other deposits on your teeth causing bad breath and gum problems.
Next Steps
Ideally you should get your teeth alignment corrected by braces, but as you may be working/studying, your braces won't be have good appearance. Please ask your dentist for more aesthetic looking braces options. This treatment will take around 8 to 12 months with monthly appointments.
Health Tips
Even if you take time to decide for braces, but get your cavities filled up and maintain good oral hygiene by professional teeth cleaning and brushing teeth twice a day.
Take care.