At anywhere from three to six months of age, a puppy begins to get its adult set of teeth. This period can be quite painful and many owners do not recognize the natural need to chew. By providing specific chew toys designed to ease the pain of teething (such as a frozen nylon bone), attention can be diverted from table legs and other furniture. Many people also use a bad-tasting, bad-smelling spray on favorite items, such as shoes, furniture, or even wallpaper, to discourage chewing. Bitter apple is a commonly used spray, but there are several commercial sprays available. Different sprays work better for different applications, owners, or puppies.