Eventhough, some people go by a time frame on when to shoe or when to do teeth. You overall must go by the horse. If you see your horse getting a bit long with its feet, yet it isn't time for shoes, you might want to have the farrier come by. Every horse is different. My gelding, needs shoes every 4 weeks. Same with teeth. You don't 'need' to have their teeth done twice a year. You can feel the teeth yourself and judge to see if they are getting sharp, etc.