Hello Plaque and tarter built on the teeth due to inefficient tooth brushing and also difficulty in brushing could be due to crowding of teeth.

Hello Please visit the dentist for the cleaning

Based on the image, the discoloration appears to be extrinsic staining. The recommended first step is oral prophylaxis including scaling and polishing. After stain removal, the tooth shade can be reassessed. If aesthetic concern persists, options like bleaching or cosmetic corrections may be considered. A clinical examination is essential to confirm the diagnosis and plan treatment.

Thanks for sharing pic. Appears to be plaque build up &stains. Visit dentist for Scaling& Polishing. Regular cleaning will prevent this.

Get scaling(cleaning) of teeth done to solve this problem

Hello Looks like extrinsic stains. Kindly get them cleaned from dentist