Does painting this clear liquid onto a cavity cause any pain or stinging?

No, painting the liquid onto a tooth is completely painless and does not cause any stinging or burning on your gums. It feels just like having plain water brushed onto your tooth with a tiny paintbrush.

Will the black spot ever fade away or turn white again over time?

No, the black spot is permanent because it shows that the silver has successfully locked onto and killed the bacteria. If the dark color bothers you later, the team can cover it with a tooth-colored filling once you feel ready.

How many times do you need to apply the liquid to completely stop a cavity?

Usually, a single application is enough to freeze the decay right away, but the team will check it at your six-month visits. Sometimes, a quick second coat is applied a year later to make sure the shield stays strong.

Can this liquid fix a massive toothache caused by a deep root infection?

No, this liquid only works on early or medium cavities that are sitting on the outer layers of your tooth. If an infection has reached the deep inner pulp and is causing a severe toothache, you will need a root canal instead.