There are a number of standard precautions to take when grappling, including keeping yourself under emotional control, wearing a mouthpiece. and never, ever grapple with a ring on, as ilustrated by the experience of a friend of a UGer.
Never Train Wearing Rings - GRUESOME!
Member Since: 2/11/05
A wrestling coach friend of ours just posted this on Facebook. This is nasty, but a good way to illustrate what can happen if you train with jewelry on. Do NOT click the link if you are squeamish.