A dental crown is a tooth-shaped cap that replaces a damaged, cracked, chipped, or misaligned tooth. You might also need a crown if you have a cavity and there's not enough tooth left to hold a ...

That’s why I was especially curious to try the Philips sonicare 9900 prestige, a toothbrush that costs as much as a porcelain crown – but will it save you that kind of expense in the long run?