When was the last you visited a dentist. You might be requiring cleaning or teeth whitening. Do not follow YouTube baking soda video home remedies as sometimes, one might tend to have reaction.
Seeing your age, looks it might be more related to oral hygiene which requires a regular cleaning. If teeth whitening is advised and you don't have sensitivity issue then you can go ahead with teeth whitening.
Next Steps
teeth whitening is done to make teeth brighter and doing by dental professional is more appropriate than going with home remedies.
visit a dentist
Health Tips
note post teeth whitening, some patient tend to have teeth sensitivity for which a relief gel is given. sensitive tooth paste need to be used after teeth whitening
also teeth whitening is not advised for severe smokers, alcoholic individuals.
avoid taking staining food items like coffee, tea post teeth whitening.