Hi i have a white and yellow coating on the back of my tongue and have halitosis. i have tried brushing with a tongue scraper and using sea salt but it seems to have only made things worse. do you have any advice on how to get rid off the bad smell?

Good oral hygiene is the best way. That means a healthy diet and brushing and flossing. If you are on certain medications, eating spicey foods ,have a dry mouth causing bacteria to grow, all these can contribute to halitosis. Have your dentist provide you with an anti-bacterial solution to rinse with. Do you have a reflux problem? Do you smoke?

Bad breath can be caused by many different factors, including sinus infections, periodontal problems, smoking, cavities, acid reflux, and your diet. Address all of these possibilities with your dentist and physician, and I'm confident that your problem will at least be minimized, and hopefully eradicated.