Nipple structure

The utility model relates to a nipple structure. Primarily, when an infant sucks a nipple, a plurality of pits or concave veins are formed on a bite part of the nipple and are used for contacting the infant's dental bed or teeth to prevent the nipple from easily sliding out from a mouth and falling down when the nipple is bitten. Besides, two different color layers can be formed on the bite part of the utility model, wherein the pits or concave veins are formed on the outer layer. Therefore, the utility model can provided a favorable biting feel and can attract infants with different colors. With the manufacturing way of double layers, in order to prevent a groove formed on the bite part from holding dust which results in difficult cleaning, concave points or concave lines can be formed on the surface of an inner layer which is then covered by a thin outer layer. Therefore, the groove can have a favorable engagement degree with the help of the concave points or the concave lines on the inner layer. Meanwhile, the concave points or the concave lines are covered by the thin outer layer, therefore the defect of difficult cleaning is overcome.