If someone gets their teeth sealed then how long will the sealing last?

Sealants. Pit and fissure sealants can last for a short period of time to over 20 years. When you go for regular check-ups and cleanings, the dentist will always check to make sure the sealants are intact. If not, the dentist will advise you to re-do the sealants that have fallen out.
3 or 4 years. The resin bond tends to break down due to the grinding forces on your back teeth. Sealants only adhere to your teeth in the area of the 20 micron etching on your enamel.. They are not placed in a preparation of your tooth.