In severe, chronic cases, bruxism can lead to myofascial pain and arthritis of the temporomandibular joints. Tooth wear
Many publications list tooth wear as a consequence of bruxism, but some report a lack of a positive relationship between tooth wear and bruxism. Tooth wear caused by tooth-to-tooth contact is termed attrition. This is the most usual type of tooth wear that occurs in bruxism, and affects the occlusal surface (the biting surface) of the teeth. The exact location and pattern of attrition depends on how the bruxism occurs, e.g., when the canines and incisors of the opposing arches are moved against each other laterally, by the action of the medial pterygoid muscles, this can lead to the wearing down of the incisal edges of the teeth. To grind the front teeth, most people need to posture their mandible forwards, unless there is an existing edge to edge, class III incisal relationship. People with bruxism may also grind their posterior teeth (back teeth), which wears down the cusps of the occlusal surface. Once tooth wear progresses through the enamel layer, the exposed dentin layer is softer and more vulnerable to wear and tooth decay. If enough of the tooth is worn away or decayed, the tooth will effectively be weakened, and may fracture under the increased forces that occur in bruxism. Abfraction is another type of tooth wear that is postulated to occur with bruxism, although some still argue whether this type of tooth wear is a reality.
All 3 heads would bleat simultaneously, and it appears to have survived into adulthood. Maines Conant Museum had an adult sheep skeleton with 2 heads. Various two-headed sheep can be seen in the Bar Central Museum of Llubí, Spain. In 2006, a two-headed lamb was born in Shandong, China. The Ripleys Believe It Or Not! museum in Gatlinburg, Tennessee, has a mount. The Llanidloes town museum in Powys, Wales, has an example of a 2-headed lamb. The Liebig Extract of Meat Company factory (now a museum) in Fray Bentos, Uruguay, has a preserved 2-headed lamb. Mice
A 2-headed mouse was seen at Hallæ. Birds
An account of a 2-headed pigeon was published in France in 1734. In 2020, a two-headed song thrush was poached in Syria. Reptiles
Snakes
Most polycephalic snakes do not live long, but some captive individuals do. Wyman saw a 2-headed snake, alive, in the Jardin des Plantes, Paris, in 1853. Leidy found a 2-headed snake in a field near Philadelphia. A two-headed black rat snake with separate throats and stomachs survived for 20 years. There are several preserved two-headed snakes on display in the Museum at the Georgia State Capitol Building in Atlanta. "We", the two-headed albino rat snake (see above)
A two-headed ladder snake, Elaphe scalaris, was discovered near the village of Pinoso, Spain. A two-headed king snake lived for nearly 17 years at the Arizona State University. A extremely rare two-headed albino Honduran milk snake named Medusa was bought by Todd Ray

Turtles
Two-headed turtles and tortoises are rare but not unknown.