Why brush a dog's teeth?
Brushing your dog's teeth helps remove plaque as part of a regular at-home dental care routine. A pet-safe toothbrush and toothpaste designed for animals are important; never use ordinary human toothpaste.
What is a parlour teeth-brushing add-on?
A teeth-brushing add-on may complement the hygiene routine you already follow at home. A single grooming appointment cannot replace frequent home brushing or professional dental care.
When is a veterinarian needed?
Bad breath, visible discomfort, bleeding gums, loose teeth or difficulty eating deserve a veterinary assessment. A groomer cannot diagnose or treat dental disease.
Further reading: American Veterinary Medical Association — Pet dental care.