It is necessary for dogs to clean their teeth. Dogs’ teeth are dirty. Failure to clean them regularly can easily lead to problems such as bad breath or yellow teeth. Many pet owners like to feed their dogs liquid food. If the food remains in the gaps between the teeth, the pet owners do not clean it out in time. Over time, the fermentation of the food will not only cause bad breath, but also cause stains and yellowing of the teeth. In severe cases, dental problems may occur. Disease can cause tooth loss, which is very bad for the dog's health.