I brush my 3 year old teeth twice daily but i have noticed a yellowish layer near her gums.how can i remove this? does it lead to decaying teeth?

Yellowish layer: The condition you are describing can either be a stain, plaque, or calculus. The plaque is a soft colony of bacteria that can be brushed off, but the stains and calculus will need to be removed professionally. Your three year old is old enough to be seen by a dentist... . Make an appointment and have the teeth cleaned and examined.

May be calculus: Tartar can build up even in the most hygienic mouths. Depending on location and water fluoridation, cavities can start. At age 3 it is best to take your daughter to a local pediatric dentist whom can advise you better.

Better brushing: Most likely this is plaque or biofilm which is being left on the teeth change the position of the toothbrush when brushing so that the bristles are angled so they go along the area where the gums and tooth meet.

Remove is decay risk: The yellow film that is at the gum line is most likely plaque or even calculus (also called tarter) which is calcified plaque. The former you should easily be able to remove with the appropriate tooth paste, tooth brush and proper brushing technique. The later will need to be removed by a dental professional. Regular dental cleaning are in order and failure to remove will lead to decay!

See dentist: It is advisible to see a dentist or pedodontist as young as one year old. What you are describing appears to be plaque and subsequent staining. Have a professional examination and prophy soon to remove all this residue and make sure there are no caries.

See a pedodontist: a dentist who specializes in the care of children's teeth. The pediatric dentist has an extra two to three years of specialized training after dental school. Best of luck.