While your dog (usually) can’t tell you about a toothache in words, their behavior can raise a red flag if you know what to look for. Why should you be concerned? Because good dental care can extend a dog’s life.

Eighty-percent of dogs have some form of periodontal disease by age three. And, as in humans, gum disease doesn’t only threaten the mouth—it can lead to kidney and liver damage and heart disease. Periodontal disease is the most common clinical issue found in dogs. The good news? It’s completely preventable.

Check your dog for these common symptoms of gum disease. Then, learn how to help make preventing it fun during February, National Pet Dental Health Month, and during the rest of the year.

Signs of dental disease:

1. Stinky breath

2. Red, swollen gums

3. Excessive drooling

4. Weight loss

5. Loose teeth