Linnea has had teeth for a long, long time. Um, over half her life, anyway. She currently has four front teeth top and bottom, and is working on molars. And she never bites deliberately, and the lower teeth are covered by her tongue when she's actively sucking anyway. So it's occasionally a problem if she's startled while feeding and accidentally clamps her jaw together, but she's never left marks.

Fingernails, now - fingernails are different! She's drawn blood with those.