Can taking amoxicillin-clavulanate tablets cause intrinsic staining / yellowing of adult dentin? it seems my teeth are slightly more yellow post-antibiotics. not sure if causation or coincidence. thank you?

Amoxicillin/clavulanic acid are not usually the cause of dentin staining. Could it be that you take coffee or tea regularly. There are other medications and some antibiotics that could however not Augmentin.

Not the antibiotics. Most likely coincidence.

No. Tetracycline can damage teeth as they are forming. First, your teeth were fully formed many decades ago. Second, the antibiotics you are taking will not discolor enamel. Do you drink coffee, tea, colas? See your Dentist; teeth can be whitened.

Liquid and tablets of Amoxicillin can cause discoloration of teeth. If very noticeable or unsightly to you, than have a whitening of teeth or try whitening strips. Teeth are not damaged from the staining.