Do Indians have bad oral hygiene than western people ?

Humare toothpaste me namak, nimbu, charcoal sab hai

For this, one has to go and smell white people’s mouth . You can try if you’re so curious.

idk about other countries but most of us indians eat large meals, chew less, then we lie down which affects food digestion. This leads to acid reflux and GERD for many leading to bad breath. Then many Indians brush once only in the morning. This means we go 24 hours without brushing. Even when we brush twice a day, brushing right after waking up is not doing anything as we already brushed before sleeping so waking up we didn't really eat anything in between. I think the right time is 30 mins after breakfast which means morning brush tackles germs accumulated over night + breakfast food stuck in teeth. Then night time brush only has to tackle the lunch and dinner food so it is a good divide.

My grandfather has stronger teeth than mine.He never used tooth paste nor ate a dough nut

I think in western culture it is somewhat incentivised to have oral hygiene and good vision, i.e. usually I see most jobs irrespective of industry to have dental and vision coverage while we don't really have the same.

Yes, I know people who only brush once a day

Yes, less than 1% of people get their teeth scaled regularly.