Always do adequate research on anything new you hear. There are many products out there that are promising excellent results only for them to make you situation worse. Go to trusted websites like dentistanchorage.net/cosmetic-dentistry and get all the information you need on a new product or service. This way you will be safe and you will always have a brighter smile.
You ought to go to the dentist in case you notice swelling and/or bleeding around the gums. Although it that are that you have sensitive gums, it could even be due to something such as cardiovascular disease. Your dentist will have a way to ascertain what's causing your gums to swell or bleed after evaluating orally.