Please choose the correct ending to complete the given sentence: Health: [header] How to apply tooth gems [title] Purchase a tooth gem kit. [step] There are a number of companies and websites that sell kits for applying your own tooth gems. You can choose from the available kits based on the types of gems you want.

Ending1: [substeps] Choose a kit that has been developed with or by dental professionals to avoid doing damage to your teeth. At home tooth gem kits will allow gems to stay on for up to several weeks. Ending2: Some kits come with gems you can attach to your teeth, while others are free. [substeps] Some kits come with your tooth gems, while others do not. Ending3: [substeps] Talk to your dentist about the buying of a tooth gem kit. They may be able to compare kits that are compatible with your needs. Ending4: For example, the kits sold at many medical equipment stores also sell the same type of gems. [substeps] On the kits, you'll place your gem face down on a sterile plate, with an additional layer of gauze, a sterile syringe, and some dental floss.

Answer format: ending1/ending2/ending3/ending4