Not everyone has wisdom teeth. Third molars usually appear in early adulthood, and grow in at the very back of the mouth.

Scientists at King's College London, UK, say they've successfully grown a human tooth in a lab for the first time.

In their latest study, researchers made a breakthrough in replicating the environment required to grow teeth in the lab.

We spoke to dentists to find the best at-home tooth whitening products you can buy, from toothpaste to whitening kits.