teeth

Fluoride - a naturally occurring mineral recognised to protect teeth against decay - is added to water supplies in many countries, including the US, where around 63% of the population have fluoridated water.

Based on the emergence of its baby incisor teeth, researchers estimate the cub was about 3 weeks old when it died.

At benches they brush and gently scrape dust from fossilized bone, with the gentle dexterity of dentists cleaning Jurassic-era teeth.

He was left with a broken jaw, missing teeth, 15 small punctures and two deep lacerations on his cheek and neck, which the 33-year-old said could scar.

The retired aerospace engineer, who lives in Sierra Madre, did about four reps before his teeth clenched, his legs trembled and he let out short puffs of air through pursed lips.