أرسل هذا في رسالة قصيرة: The relationship of dental calculus to caries, gingivitis, and selected salivary factors in 11- to 13-year-old children in Chiang Mai, Thailand

 _____      _____                ___      ______  
|  __ \\   |  ___||   ____      / _ \\   /_____// 
| |  \ ||  | ||__    |    \\   / //\ \\  `____ `  
| |__/ ||  | ||__    | [] ||  |  ___  || /___//   
|_____//   |_____||  |  __//  |_||  |_|| `__ `    
 -----`    `-----`   |_|`-`   `-`   `-`  /_//     
                     `-`                 `-`