Do your teeth, gums, and jaw ever ache for no apparent reason? We are not talking tooth pain like, I haven’t brushed my teeth in several weeks tooth pain, but instead, my teeth, gums, and jaw have a constant dull aching for no apparent reason. If so, you may benefit significantly from a Bite Guard. Bite Guards are dental appliances used to protect your teeth in different situations. Dentists use Bite Guards for patients in a variety of different circumstances. They are appropriate for both kids, and adults. There are varying qualities of Bite Guards.