To use one, you just have to put it in hot water to soften and bite into it ... Mouth guards are typically designed to fit either upper or lower teeth. Which one to buy largely depends on preference.

Permanent incisors tend to grow in around age 7 or 8. Canines are the four sharp teeth on either side of the upper and lower incisors. They are the pointiest teeth and help you tear apart foods ...

Although these bite marks provide a glimpse into megalodon ... making direct contact between upper and lower teeth improbable. A tooth would need to be dislodged or out of place for such an ...