Hello, A small black dot on a molar may be an early dental caries lesion, a stained pit or fissure, or another superficial defect. A clinical examination is necessary to determine whether a filling is required. If the lesion is non-cavitated and the enamel is intact, preventive measures such as fluoride application, appropriate oral hygiene, and monitoring may be sufficient. If cavitation is present, restorative treatment may be indicated. The chalky, milk-white spots may indicate enamel demineralization or a developmental enamel defect. Their appearance and distribution should be assessed to determine the cause and appropriate treatment. Professional scaling and polishing can help remove calculus and extrinsic stains, but they will not treat a cavity or correct all types of white spots

Hello For black dot if it's a cavity the filling would be required but if it's not too deep then you can just main hygiene so that it doesn't gro deep. Scaling will help to remove the calculus which is formed