If you suspect your dog has rotten teeth, it's essential to consult with your vet for proper diagnosis and treatment. You should never try to treat health issues, including dental problems, with at-home remedies, nor should you try to remove your dog’s rotten teeth yourself. As always, we recommend you seek out veterinary advice as soon as you suspect a health issue.  In terms of dealing with rotten teeth in dogs, your vet will first have to examine your dog’s mouth thoroughly. They likely have to perform different tests, such as dental X-ray to evaluate the extent of the problem and determine the right treatment plan. For severely damaged or rotten teeth, the best possible treatment would be to extract the tooth or teeth to prevent further infections. In milder cases, professional teeth cleaning to remove plaque and tartar buildup could very well be enough.  In some cases, a veterinary dentist may perform root canal therapy to save a damaged tooth and alleviate pain. If your dog also suffers from an infection due to dental problems, your vet may prescribe antibiotics and pain medications to tackle the problem.