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Cotton swabs (American English) or cotton buds (British English) are wads of cotton wrapped around a short rod made of wood, rolled paper, or plastic. They are most commonly used for ear cleaning, although this is not recommended by physicians. Other uses for cotton swabs include first aid, cosmetics application, cleaning, infant care, and crafts.
It is widely accepted that there is a factor within the tissues of the first branchial arch that is necessary for the development of teeth. [2] The tooth bud (sometimes called the tooth germ) is an aggregation of cells that eventually forms a tooth and is organized into three parts: the enamel organ, the dental papilla and the dental follicle. [3]
Tooth development is commonly divided into the following stages: the bud stage, the cap, the bell, and finally maturation. The staging of tooth development is an attempt to categorize changes that take place along a continuum; frequently it is difficult to decide what stage should be assigned to a particular developing tooth. [26]
The first sign of tooth development is known to be as early as the 6th week of intrauterine life. The oral epithelium begins to multiply and invaginates into ectomesenchyme cells, which gives rise to dental lamina. The dental lamina is the origin of the tooth bud. The bud stage progresses to the cap stage when the epithelium forms the enamel organ.
The bud stage is characterized by the appearance of a tooth bud without a clear arrangement of cells. The stage technically begins once epithelial cells proliferate into the ectomesenchyme of the jaw. [1] Typically, this occurs when the fetus is around 8 weeks old. [22] The tooth bud itself is the group of cells at the periphery of the dental ...
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Although tooth eruption occurs at different times for different people, a general eruption timeline exists. The tooth buds of baby teeth start to develop around 6 weeks of pregnancy. Adult teeth buds start forming around 4 months of pregnancy. The entire tooth will start to form from the crown down to the root. [8]
Candy isn't always bad for you -- 14-year-old Aline Morse created a holiday lollipop that turned into a booming business. What started out as an in-home experiment has transformed Zollipop, a ...