has a knot tied in the middle and placed in the gagged person's mouth or is an over-the-mouth gag (OTM) placed backward with the knot tied inside the person's mouth. The knotted gag is able to soak up the saliva that the ball gag does not and can be easily washed for reuse. Knots can be doubled or tripled to fit the size of the gagged person's mouth. Layered This is a term for a series of gags over each other; for example, an over-the-mouth gag (OTM) over a cleave gag. Another piece of cloth could be tied under the gagged person's chin in conjunction with an OTM gag. Medical Bondage pornography also depicts the use of medical gags such as the Whitehead and Jennings gag in BDSM contexts. Such gags allow unlimited access to the mouth. They stop coherent speech, but do little to silence a person. Mouth corset A mouth corset is a type of neck corset that covers both the neck and the mouth. Incorporating a gag into a neck corset presents a few safety issues: should the wearer begin to choke, it is not easy to remove the gag quickly. For this reason, most mouth corsets use a simple muzzle gag that merely covers the mouth and does not force anything into the mouth, thus minimising the risk. Despite not forcing anything into the mouth, mouth corsets are usually very effective in gagging the victim. This is due to the fact that the chin piece prevents the wearer from opening their mouth and dislodging the gag, and the lacing at the back of the corset holds the gag tightly against the mouth, making a very effective seal. In addition, it compresses the wearer's cheeks. Mouthguard This gag has two mouthguards, similar to those worn by football and hockey players. One rests on the lower teeth of the wearer while the other is against the top. Again, like sports mouthguards, these mouthguards can be softened in boiling water to fit to the mouth of the wearer. The mouthguards are attached to a front faceplate, like most plug gags, and straps from the front to the back. Muzzle A muzzle gag works in a similar way as an over-the-mouth gag, only that they are usually made of leather, are fastened around the head with buckles and straps, and cover the lower part of the face. It is so