How do we take care of our teeth? due to unhealthy eating and lack of oral hygiene my teeth are becoming yellow and my gums are becoming light or dark brown color. natural and home remedies to take care of teeth?? lockdown-cannot access healthcare?

You'll need to brush thoroughly for two minutes, and then floss between each tooth. That will help, but may not be enough. Hardened calculus needs to be professionally removed by a hygienist or dentist. Limit sugary, sticky snacks. The lockdown is finite. ICYMI, you are allowed to leave your home for medical care: https://www.nsw.gov.au/covid-19/rules/greater-sydney#reasonable-excuse

And how long did you go before the lock-down without professional dental care? There is good reason for regular 6 month professional care. Brushing 2x/day and especially flossing 1x/day should slow down the spread of your dental disease, but professional care is required to put you back into good health. CALL a dentist and discuss options.