Hello lybrate-user, Please don't get mislead by the advertisement. Teeth don't shine by using just a toothpaste.
You should consult a dentist and take scaling and polishing.
It will help to improve it.
Then use homoeopathic toothpaste heclalava.
Take vitamin C supplents.
Avoid bad habits,
Massage gums with Turmeric and Salt twice daily.