Light black spots on teeth without pain even i don't eat sweets how can i cure it?

See a dentist: I couldn't tell you exactly what they are but it sounds like decay. You can't cure it but a dentist can identify the cause and help you.

Diagnosis is key...: Neither abstinence from sweets nor an absence of pain can rule out the possibility that those light black spots may represent tooth decay. As is the case with any health problem, diagnosis must precede treatment. Your best next step would be to arrange for a diagnostic session with your dentist. This will point the way to an appropriate therapeutic approach.

Spots on teeth: Dark spots on your teeth could be staining due to coffee, tea, cola, wine or they could be the beginning of a cavity. Sweets aren't the only things that cause tooth decay-chips, crackers and refined carbohydrates can do it too-see a dentist and have it checked out.