Tooth yellow how white tooth why can you become yellow?
Exogenous yellow teeth: yellow or gray due to food coloring on the tooth surface;
The stain of smoking, the pigment of drinks, coffee and tea, etc. are yellow-gray on the teeth.
Endogenous yellow teeth: teeth affected by a certain element, pigment is not on the tooth surface but in the tooth tissue, there are two main types: dental fluorosis and tetracycline teeth.
Dental fluorosis is caused before the age of seven years old, living in the area with high fluoride in drinking water. The pigment is in the tooth surface enamel, presenting yellowish brown patches, and there are uneven defects on the tooth surface, generally the incisors of the upper jaw are the most obvious, so it seriously affects the appearance.
Tetracycline teeth are caused by the use of tetracycline drugs before the age of seven. Tetracycline molecules can combine with calcium in tooth tissues to form extremely stable chelates, which can be deposited in tooth tissues and cause tooth coloring.
All teeth can be brownish gray or brownish yellow.
How to whiten teeth?
Ultrasonic teeth cleaning: suitable for exogenous yellow teeth.
The hard tooth knot stone that can remove presses gingiva, prevention and cure periodontal disease, ALSO can remove tooth surface stain.
However, it is worth noting that the minimum interval between two ultrasonic teeth cleaning is three or six months, because the painted teeth leave very shallow scratches, which must be re-mineralized by calcium in saliva over time to recover.
“Urea peroxide” bleaching: suitable for tetracycline teeth bleaching.
It releases new oxygen, bleaches the color of teeth, and has no toxic side effects.
But this bleaching only works on the surface of the tooth, and over time, the tooth will return to its original color.
Cover shading technology: suitable for tetracycline teeth and dental fluorosis, the method is to use weak acid to corrosion the tooth surface, so that the tooth surface has small convex and uneven plane, and then coated with photosensitive resin in the colored tooth surface to make it solid.
The effect is natural and realistic, but also strong gloss.
But for a long time, it will change color and age (up to three years) and need to be returned for repair.
Porcelain CROWN TEETH: DEACTIVATE THE TEETH TO BE WHITENED AND GRIND THEM INTO A CONE shape. Wear the porcelain crown to make the teeth white and beautiful, wear-resistant, durable and unfading.
