There is a seaweed product you sprinkle on their feed which is meant to reduce plaque. I admit to using the dregs of the horses seaweed suppliment which seemed exactly the same and a lot cheeper. Hattie going for second vac tomorrow so will consult with vet to check if seaweed is the way to go. Not too bothered about baby teeth!
'Plaque off' is what your'e after- a 60g pot is around £10 ish and should last8 weeks or so for a small dog. Plaque off will not stop plaque building up but does reduce its ability to stick to the teeth so brushing or removal from chewing/ eating dry food/chews should remove it quite easily.
Tbh i think bones are more effective so if you are a raw feeder, this is certainly the way to go.
As for vet nurses pushing toothbrushing- does she do her pets everyday?
I understand that in that job you have to advise the client of all options available to them for the care of their pet. Things like toothbrushing everyday is probably 'gold standard' in their eyes but you also have to be realistic. If i speak to clients re toothbrushing etc, i also tell them that although i own a couple of doggy toothbrushes and toothpaste, i can't remember the last time i used them!!

With teeth cleaning, there are various options/ products available (with varying efficacy) and it is just a case of finding the right one for your pet and your lifestyle.
