What are these brown spots on my dog's teeth that won't brush off?

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.

Yes, it can be normal. It is suggested that you start brushing the teeth. At this point it may not remove that staining but it will prevent more from accumulating. Here is a link to a video on how to brush the teeth. Once daily brushing is recommended. If you don't do it often enough it won't help. ( https://www.youtube.com/watch?v=PsNlLLSBWLU&t=47s ) Hope this helps. Best wishes.

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.

This doesn't look like an infection to me, this is just normal deposit on top of the tooth, this can be removed with scale and polish procedure, but at the moment it is not nearly bad enough to have this procedure done, maybe in a few years.

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.

Good on you for brushing Cleo's teeth a couple of times a week! That is really awesome. Brushing the teeth is great, but there can still be tartar build up over time. Cleo could have also injured her tooth biting in something hard. I would have her seen by a vet for this tooth problem. She may benefit from a dental cleaning, scaling, and polishing, and the vet can examine the tooth to determine why it is brown and how best to treat it. I would have her seen by a vet this week.

I understand your concern for Penny. I see some very mild tartar accumulation along the gum line of the canine tooth. There also appears to be significant staining on the second upper incisor. Significant staining such as this can be seen due to enamel defects on the tooth which allow more tartar accumulation and staining to occur. Enamel defects can occur due to injuries to the tooth such as from chewing on metal cage bars or other unapproved objects. Given the significant difference seen on the incisor, I would recommend that you have Penny's teeth checked by your veterinarian. They will be able to determine if there is an enamel defect present or if there is another potential reason for the tartar accumulation in that area.