Giolyn,
Reyden will grind teeth too. As long as it's not too bad and affect sleep should be fine bah. My mum had been grinding for years too.
Kelley, Autum,
It's not about age. Sometimes could be sub-consciously. Reyes knows it's wrong but will still put things in the mouth. And it's everything too, from pen, toys, to dog snacks and her own hair. :S