Q. I have a 5-year-old son and he needs to visit the dentist at least twice a year because at least one tooth ends up turning black. I brush his teeth every day after he wakes up and before...

Q. People sweat a lot when the weather is hot or when they indulge in a lot of activity. That is generally followed by unpleasant body odour. The problem is usually solved, at least temporarily, by a bath. However,...