What is that on my dog's tooth? Is it a crack or infection?

Hi, According to the pic I think it is a tartar built up. Too much plaque and tartar build-up can push the gums away from the teeth, exposing new areas for bacteria to develop which causes inflammation of the dog's gums (also seen in the picture the gum line seems inflamed). But it can also lead to cavities, infection, tissue destruction, tooth loss, and even pus (abscess) formation. So please schedule an appointment with your veterinarian to see if your dog is a candidate for a dental scale and polish.

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

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.

I'm not sure what you mean by "it caries" - definitely try to repost with more description if I don't hit on the answer you need, but it looks like there is a moderate amount of tartar on that molar, and possible a draining tract up in to the gums, which would be caused by an infection of the tooth root. It's possible that part of the tooth is broken under the tartar and we just can't see it. I would recommend scheduling a vet visit to have this looked at it.

That appears to be just some build up in a normal furrow in the 4th premolar tooth. This can occur with normal wear on the teeth. You can try brushing your dog’s teeth, at least 3x per week to help prevent any further buildup from occurring. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.

Black discoloration could indicate an infection or a foreign object trapped at the gum line. If you cannot easily remove it (be gentle), I recommend to have Jasmine examined by the veterinarian. Small dogs are more prone to dental disease and it is best to be proactive. Here is a link about oral health and care for pets: https://www.petcoach.co/article/a-comprehensive-dental-care-program-for-your-cat/ I hope this helps and please feel free to post any additional questions.

It appears to be some moderate gingivitis and tartar. The tooth underneath the red area may be affected, and may not. It would take an xray of that area to know for sure. I recommend getting her examined by your veterinarian and planning a dental cleaning and oral x-rays.