Reusing bottle

Hi guys my 8 month old has started refusing bottles. He has two bottom teeth and I can see the two starting to peak through the top (hasn’t broken the gum yet) but you can see it along the gum line.

Is the reason he’s refusing his bottle because of teething. He started refusing make a week ago. But when I am home in the evenings I breast feed him. So basically during the day with his nanny he refuses, but when I’m home he drinks from the tap no issues.

How long does this normally last? Ive got tons of breastmilk stores he just won’t eat