What are these brown spots on my dog's molars? Cavity or buildup?

That looks like the start of plaque and staining. You may not be able to brush that off as it usually requires a scaler and polisher to remove. It is normal over time for that to happen and it is just him constantly eating and chewing, the same as us. Over time more will develop on all the teeth and will need them clean, but for the now, the gums are healthy and there is no sign of an infection so just try to keep brushing as often as you can

Thank you for posting pictures. (I know that is always a challenge with a puppy!) From the pictures, the brown area just appears to be particulate build up on the tooth. That particular tooth has 3 roots, so there is a depression between the roots that things can get stuck in. (One of my dogs always has problems there.) I would recommend using an infant toothbrush and pet toothpaste (my favorite is PetSmile (http://store.petsmileusa.com)) to brush her teeth and continue daily. I hope that was helpful! Thanks for using PetCoach.

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Thanks for the pictures. The brown on the teeth is enamel hypoplasia. Enamel formation occurs around 2 weeks to 3 months of age. Anything like trauma, a fever, nutritional deficiencies, infection, metabolic abnormalities, toxins and parasites that occur in that window can cause enamel hypoplasia. Distemper viral infections and other Morbillivirus species infections are commonly recognized as causes. I hope this helps and have a great day!

The teeth look absolutely fine, the dark color in the middle is due to a small area in the tooth that is much deeper than the rest of the teeth, it can be rectify only via dental scale and polish but it will likely come back within weeks, anyway - nothing to worry about.

This looks like dental staining. She does have gingivitis and dental plaque so I recommend a dental cleaning. When the teeth are scaled and polished the stained area may disappear. Also when they are working on her teeth they can check this area more closely to see if any additional treatment would be recommended. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Chutki.

I would not be too concerned about the tooth at this time. It is difficult to tell from the picture, but the tooth in question looks as if it is a baby tooth that has broken off. If this is the case, the tooth will fall out sometime between 12-16 weeks of age. If this is an adult tooth, then I would recommend you continue to monitor it for now. If the tooth is still looking abnormal at the time of your dog’s spay (around 6 months of age) then your vet can remove it while she is already under anesthesia. This way it will not cause any future problems. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.

Both teeth look normal. The gums above the tooth are pigmented in the second picture, which can be normal. (like a freckle inside the mouth). There is mild tartar calculus on both teeth but the gums look healthy. Thank you for asking Petco Pet Education Center, formerly Petcoach! You are doing a good job with the brushing!